JavaScript与PHP中正则

时间:2022-09-25 13:50:58

一、JavaScript

有个在线调试正则的工具,点击查看工具。下面的所有示例代码,都可以在codepen上查看到。

1.创建正则表达式

var re = /ab+c/; //方式一 正则表达式字面量

var re = new RegExp("ab+c");  //方式二 RegExp对象的构造函

1)正则表达式字面量在脚本加载后编译。若你的正则表达式是常量,使用这种方式可以获得更好的性能。

2)使用构造函数,提供了对正则表达式运行时的编译。当你知道正则表达式的模式会发生改变, 或者你事先并不了解它的模式或者是从其他地方(比如用户的输入),得到的代码这时比较适合用构造函数的方式。

2.正则表达式中的特殊字符

\    ^    $    *    +    ?    .    (x)    (?:x)    x(?=y)    x(?!y)    x|y    {n}   

{n,m}    [xyz]    [^xyz]    [\b]    \b    \B    \cX    \d    \D    \f    \n    \r    

\s    \S    \t    \v    \w    \W    \n    \0    \xhh    \uhhhh   

3.正则表达式中的方法

有个,分别是exec、test、match、search、replace和split。

exec和test的语法都是regexObj调用,match、search、replace和split的语法都是string调用。

exec

方法为指定的一段字符串执行搜索匹配操作。它的返回值是一个数组或者 null。语法如下:

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示例代码:

var re = /quick\s(brown).+?(jumps)/ig;
var result = re.exec('The Quick Brown Fox Jumps Over The Lazy Dog');

返回结果:

aaarticlea/png;base64,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" alt="" />

test

一个在字符串中测试是否匹配的RegExp方法,它返回true或false。语法如下:

aaarticlea/png;base64,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" alt="" />

match

一个在字符串中执行查找匹配的RegExp方法,它返回一个数组或者在未匹配到时返回null。

与exec略有不同,首先是调用方式,math是由字符串调用,而exec是由RegexObj调用。

其次,如果表达式中有“g”标记,那么返回一个匹配的字符串数组,如果没有就会和exec返回的一样。下面这个demo就是有“g”。语法如下:

aaarticlea/png;base64,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" alt="" />

示例代码:

var re = /quick\s(brown).+?(jumps)/ig;
var result = 'The Quick Brown Fox Jumps Over The Lazy Dog'.match(re);

返回结果:

aaarticlea/png;base64,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" alt="" />

search

一个在字符串中测试匹配的String方法,它返回匹配到的位置索引,或者在失败时返回-1。语法如下:

aaarticlea/png;base64,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" alt="" />

例如上面的示例代码如果是调用search,返回数据就是4。

replace

一个在字符串中执行查找匹配的String方法,并且使用替换字符串替换掉匹配到的子字符串。语法如下:

aaarticlea/png;base64,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" alt="" />

var re = /(\w+)\s(\w+)/;
var str = "John Smith";
var result = str.replace(re, "$2, $1");

返回的结果将是:“Smith, John”

split

一个使用正则表达式或者一个固定字符串分隔一个字符串,并将分隔后的子字符串存储到数组中的String方法。语法如下:

aaarticlea/png;base64,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" alt="" />

limit就是限制分割后的数组中的个数。下面的是一个demo,但是表达式中有一个是加了括号,一个没加,返回的数据是不一样的。

示例代码:

var re = /(\d)/;
var result = 'Hello 1 word. Sentence number 2.'.split(re);
console.log(result);
var re = /\d/;
var result = 'Hello 1 word. Sentence number 2.'.split(re);
console.log(result);

返回结果:

aaarticlea/png;base64,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" alt="" />

4.正则表达式执行返回信息

var myRe = new RegExp("d(b+)d", "g");
var myArray = myRe.exec("cdbbdbsbz");
console.log(myArray);

代码中返回的结果如下:

aaarticlea/png;base64,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" alt="" />

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6Tn9mStVYxIGA7cTBkAEDVeAEB061VDAjYThwMGQBQNeSJaHjW9PeuJ0LEvdR/I2soYHkjcyDgymBBCKY4GDIAoGqYJKJ+5LcPL8+626Hnh2FnJt2457W+XpzubQWBF9Q73P9DCQKuDBaEYIqDIQMAqoahgANvM/mv7R6OW7P/4j3ueX5Q714NhRD3P5rBznFutatoDQKuBhaEYIqDIQMAqoahgJvHM2WOL3e9ztVYCBH3vLc/ZpufLjpB5/KJ1xoEXA0sCMEUB0MGAFQN01vQz8qcv/W7+B5wHAVN1l1oCLgyWBCCKQ6GDACoGoUFPDxte91fE5ER8ONJK+heT0xbqywQsJ04GDIAoGqY3oL+djcRQojhVXezEcUTIZJb0EfTzZd79c1ezPEvBFwdLAjBFAdDBgBUDZNE9HDeadaDwPOD2uaHL7ej6eb7n523jZofeH5Yf39wMyLbeAYCrgwWhGCKgyEDAKrGyyUiCLgyWBCCKQ6GDACoGhAwDQRsJw6GDACoGi+QiPBb0FXDghBMcTBkAEDVQCKigYDtxMGQAQBVA4mIBgK2EwdDBgBUDSQiGgjYThwMGQBQNZCIaCBgO3EwZABA1UAiooGA7cTBkAEAVQOJiAYCthMHQwYAVA0kIhoI2E4cDBkAUDWQiGhcETAAAABQNfLCslDALz2EdeNgyACAqoFERAMB24mDIQMAqgYSEQ0EbCcOhgwAqBpIRDQQsJ04GDIAoGogEdFAwHbiYMgAgKqBREQDAduJgyEDAKoGEhENBGwnDoYMAKgaSEQ0ELCdOBgyAKBqIBHRQMB24mDIAICqgUREAwHbiTZkzw9MXy2wi7aadq8CFTgjYY7WqOYa0AZLjLbYRM1r0qVwR6bng9GwtTsW6B0Y4WDuNQICtpPSBZxsWd7BpSfcvAYINxj1q62p1dJ80rTbiQbpwRhVWNI3TLOWLmC+/rWvFugdLIODudcIxwX899ubsPbvr7FRc8Ozpt+Llx/WKsmHzLEFIYZ0O6pOtflLmgE5ulJl1fxlgXTMnGaL1dT2m6mwpLE4us3Pp2oXWS8P592dMAi8oN7c/z0qNE6+1Tjj5+xFoL3+4BxoUBgL9LFSIGBXBJzGyJR8PWhf4riBk/hU3uXLpvSaJQo435TqSqjAfJJHdhJHjXqUePfxotuo7/8hxiltXHWRxKnMNHe5Ai7cMuCgTETj/uHb0GudDdc7nqrhuIAL8coFbJSGpKsE6V6q1lTNqvrlC5julO/R/NgK1CQErF1dcVZp2t4LzGf2pcmvrv/hfL7sHZ41g4XznGOszFD5s0eMn1PS7aimWtWj9gCBwkgT0fDy89bbg/PDNgTsroCHp+3pH1vUT23uR37v4u5HZyP0/LDx79X8/BjHR53t0PMDLwhrzwJ+vMjfshueNYPGl0HyZHTRCetR32yRvTTLC7hADuK7WatMOs8SO6o2MjO4dEdOFLSApf9K95UOjCNg1QwYCPj+qPHm6P75eT/y2ydDdX2dgLWyNB2/9gSgT1rVxQEnLlAMWSJ6OP50dDcWw1MI2GEBJwxP2zkBh7Xt3s1YiPHvjxthlJj2/mhrY/fkfpI8/mcq4Oktu7EQYvJw3Aqbp4/zZmubBwMhRpe7te10UlsTqpDzGpNmn0z211oqvdFIwJz0Sr+qzfhGreVfWp2AiUFyVMGcTwMBx73FhPh40gqi2HgNqpoH7VCJALVP6U7pFvinDTBFk3shYAg4J+Dm8eykuPkUJE4d7Ncb3x9m+8xuQU9+df2968ls19vPXutsdgPv6bobbu1/7QYLa4i1IQ1Zlf2lSUeVUlVpnaNn2uUGqmC8lOmigEK0T/kCzg/GKCiVnzjzubyAlfXZk6PqnX8+MAVZWMBG7QA+EDANBJwX8LMy42gq4PkDIVICHp41M3khfT4Nz5p+EC40vj6kn4LOPJA+ldZPZ71lBEw/LpBVVblbOx5iC9PT2ii0+V2l6nx3KidxRmJw3Ic//snegn6+GCUCkW6Z9240e8SAOVHwj5fQHfF8v7ByASBgGgiYK+B/jmcCvvvaSAQ8vuqkV8ALPJ60wu75VbQxfzN4rSzzHvB8uzSDS+VhlJpVnapSNq0lzrKmgDlUNYsJmNaqair4QdHzKa0g296PgmU/hCUWXWU6e9LKnJNBBVPAdFz0NQEggIBpIGCWgMeXu17rx70QYnjVfduoT98DHl10wq39/ijn4OFxu9a5Ggkxvt6rbfbicZnhcFjyQ1iZHMrXHnMLZ3Gj3c7fiy91o94JzRASEoo5LBAUXT99QcNsZ7Cf/hpSPf01pGKHrBQB09tLETB9MkDAhYGAaZwV8ONJa/FPbqphuYCTTzvX/KC2vXcx/B3NPwU9/nuSfAraDzx/Zuu4V/fbs3t3o4tOGH76vWYFl7IClj7Iy6NAoly/gLV7FRawNilzBKxS+PIC4y/vhBBCjG7228mn+re6V0P1Xsx+yxKw9DFHh0wBE3vNt8C+BWDlXoc17KyALYcWMGcVqBIwsVHal6pfujJn+yr2MqrJbEQ1z/n5pOcnv4vpfJrOvLYCoa58RPkTjDl+0ys5ZmUjAYNiOJh7jYCA7YS/AtZWS2dSkcqbzKZof8+fqlKwduWh0sx6BKwtqhHmW9AOQ3WFlO8i3yDdReG5ItSorcAcv9TZnOFpa6ouEZhHBHBwMPcaAQHbiYMhAwCqBhIRDQRsJw6GDACoGkhENBCwnTgYMgCgaiAR0UDAduJgyACAqoFERAMB24mDIQMAqgYSEQ0EbCcOhgwAqBpIRDQQsJ04GDIAoGogEdFAwHbiYMgAgKqBREQDAduJgyEDAKoGEhGNKwIGAAAAqkZeWBYK+KWHsG4cDBkAUDWQiGggYDtxMGQAQNVAIqKBgO3EwZABAFUDiYgGArYTB0MGAFQNJCIaCNhOHAwZAFA1kIhoIGA7cTBkAEDVQCKigYDtxMGQAQBVA4mIBgK2EwdDBgBUDSQiGgjYThwMGQBQNZCIaCBgO5GG7PkBv4V8Ze3uBSpwhmQ0bABAdXAw9xoBAduJKmS+zFYhS88P5iW/RbUvBAzAK8XB3GuE4wL+++1NWPv313itw1kHnKOWkV9GgRntSS0obUHVZvJA2kW+L06DAICKI09Ecc/z2ydDMTxte34v5jc3PGtO6z+etIJIsmc/8tsnQ2YjYnja9qI+t/e457XO6Laz9XVhQsArEvDo/N/GF4Mzq2TyIXNEO3ekSp/S+jQq7xKCp90PAQPwWoCAIeAXCUF1fqwJImSO+Yhlq7QaAXMlXfgpAKCyyBPR8Kzp711PhIh73puje35zr0vAjDDdFfDwtD1d5C0cgH7k9y7ufnQ2Qs8PG/9eTac77nnR1d3p3lYQeMHWfy4fhRCZk2B+LOMoe8u0efq4yvgk8N8D1gpYex/Y6EYxU8C4BQ2ABRjq4+nudG9rI0z+zOepdRwfdbZDzw+8IKylBPzx/PeXVr3mB7Xtg3h6G7Mf+e3Dy7Puduj5Ydh59qWsETE8bXufft7st8Mg8IKdL/HTrPrDeXcnDJKEM1u8xj2v9fViaoF6Z5bVn1XiB54fhFF/stz8OCHghNwVUD/yw9p272YsxPj3x41wehLEPc8PG5+uhkKI+x9N/8P5SKgELET2pfVDC5i+BS19IG1HhXav5Z0NAKg+RvoYHrdrbw/i0eLW+6Otjd2T+0ny+J+UgL2g/e3uSYinm6hR6/6aCCFEP/IDb3PvYiiEeDhuhVvHD+pGEneGze9/x0KMb3v1YO86qXK8E376nX1rMu55flDvziwQ7BxnVrXjfvT2843JO5oQcF7AzePZVdPNp9niNe55b3/MNj+etIKPt+LVCVjqOfrd2QLyI3bhKFa7/MUiGIDXgok++lFQ/zLIbh3s1xvfH6ZPFm9Bf7ydVzoINw4GSSOpBD6+3PU6V2NlI8kK+PeslT9fNqYDuD/e8bZ7N8PFpeyCBZ4uOkHn8in18lMcNaP4SZgAAecF/PwWQhylBPx89//xpJVsf00CTsvVdAXM9x/9krZfaQvaLVAyANXEQB+js6bs7dvnJCzU7wE/b198D3iWtxWNEEn7Kf6+u7UR1jZ2uqd/x4utSQYmxPj28z9R3/TzvBBwAQE/fHuT3JpeOAnuDreqLOCEjIDp1bC2Gn+1mhe/ahimAtbeLQcAvBRmK2B/61vuo0pxFPxzPPPc3deGVMBxrzb9lNNCAh+etr3ur4mykUz+70dBdgCT+6vu5mylm1uGda9nS+Txr+6bXmyqXwjYQMBvkwM8uT/dDTeT2x1PF51g6/CvEGJ4uVdf/DxXHIWSdxHWBfNDWMyndDXmS8Sry9yChoABqCwm+pjEUb3WOhosvgc8vtz1Wj/uhRDDq+7bRj0l4O7lRAghxn+/tcLZYrQf+c1vdxOR1N9sRPFE3Uhi6KuJEEI83X1v1/Ifcp48HLdSAn57NG37cq++2Yun/h1ddLaimP/Rq2ecFfDjSWsxp0/dqRbwtGZYf39wMz9FhmfJ56W3uj9vjhddPvr1cbteq/CnoDkrS3rlSrfPfxW3oAGwEkN9jG72P9Snnz2eL3AfL7o7NT+obe9dDH9HU3c+xfsfGhuh5wcLd4nFw3mnmbRQ2/zw5XaeqaWNiHF88O5NveYHXlDf6p7dTVtJ2SHY6Xyf3Vi+/9l526jlLDC+/G9tYXlg8M1mZwVsiOk3wF4arYClxlrpe8DEq8X2AgBUHAv0sVIgYB52CVi6piTczFkBa91M9AsBA2AlFuhjpUDAPGwRMAAArA0kIhoI2E4cDBkAUDWQiGggYDtxMGQAQNVAIqKBgO3EwZABAFUDiYgGArYTB0MGAFQNJCIaCNhOHAwZAFA1kIhoIGA7cTBkAEDVQCKigYDtxMGQAQBVA4mIBgK2EwdDBgBUDSQiGlcEDAAAAFSNvLAsFPBLD2HdOBgyAKBqIBHRQMB24mDIAICqgUREAwHbiYMhAwCqBhIRDQRsJw6GDACoGkhENBCwnTgYMgCgaiAR0UDAduJgyACAqoFERAMB24mDIQMAqgYSEQ0EbCcOhgwAqBpIRDQQsJ04GDIAoGogEdFAwHZSkZA9P6C35CtkXs3XV+1CN2VUUzvsJQdQrJ1l2k/mTVoKt7kk+QGYDoa/r9FZV6zCOs+Qwqx/ABVJRJUFArYTachEFk5nQ852osFMj/kx0BWEIjVrbWGUXDjiJyJdfgD0Xpx5Yx5NemwFmlVVE7J5I5qlx8PZha9VUwFr66ziDCndjsxTa6U4mHuNcFrAcTT7g2mdDXWNDE/b/MovjkrA+cd0siimB9V26Y7SXMZpny8hI13lA1cNjO8/FUxnMJMm3RpnkCs6Q/hJny9RfrOcs64iZ8h6HLxO5Lk37nl++2SYJNVeLKnxeNIKonhWWZJyUxWUpOs8nrQCL+oL0Y/8oHn6aBjHqnBdwJIjMe4fvm/U/MALdrrnD7l9pGdD5VingPNNSRuXZj26HVWP2iGZ7i7UWZWjKM5T5qiWkbqRvbRjfhEBExBnCzFLzLOuOmfIihxsei6VBQRMAwFnjsTjSStsHj9MhBjffW369SieLO5jv4C1f6vaFKMScKYL1fC0SZMzYGKQqkaIp5w6pQhY9dLylyAco6/iDKF755tAO73aQ0acddU5Q1btxfV4d4489w7Pmv7e9USIuOe9ObqX1ChdwCKOgsb3h2Rj93pC7rg+IOBFAQ8Owo2DwXOF0Ov+WjhWbghY+q90X2ky5QiYGJ50kUHIlZnIjLI/M70W9orpqxy/EhWYlH6GqFqQdk1HwVQpvRen2Rc/Q0o/lKU3zsdMH+P+t85OzQ88P6wFaQF/vTjd2woCL6h3phn78aQVfDz//aVVr/lBbfsgHpONVBUIeEHAw9O29+m3EEKIp7vzz/8EQfYCzWEBE4kj0xpfwMyNqtFKs78qLn4d+gqjlNRWooC1U8Qp+X1LPEP4M0PPvDReuhf+WUePx2icS54hZTnS9O+CGHlhTPTx8G273jl9mA8AFP4AACAASURBVCSP36YE7Af17tVQCHH/oxnsHN+L6S3loP3t7kmIp5uoUZuulBSNVBUIOC/gq/vLg3+C8J9PP+8GP/7JvEXhhoAzNQnPSRtRZTpphspXZgq4WBJUjZnzEhGO6RjKEnCJUlE1svwZktezVtUFDp/KN8yzjtOF9qVSzpDSLchs/IUFPDgIn1c7i7eg3/6Ypdyni07QuXyaroBvU/smdy5VjVQVCDgnYD9s/Hs2GCU1ejVnVsB0wlVtlyYUrRW0I+E0KG2N3sh5VZWpicf8LfRLpimbGA/xtLCAC5wh2leXF3CxKdJ29IJnCMeCfFnOJ5/j/tIx0MdCalW+BzxL2otyHZ41k5WSqpGqAgEvvgcc92rJpwOEEEIMT9s1Z94D1mY0vk6MBEzvpX2Js5EvNmmk2nD4W5ivFmicrkDMhnaX5c+QlQqY2KKKSDq2ipwhTPsWqMzfpUTMBPy80v17+EYq4PlHqBblOl8pqRqpKhBw5lPQf75sBvXo91gIMbzqbjS+DDL72CDg/N9kOherkoKRMPLbVypg0wv8Yq8Wk/oyvag2mqZy7eRnXirxDNEeO2k7axYwfzt/r2JnSLkCNmqfM+2mGOhjfNXx28n7uxfdZn0zfQv66G4ihBDDy736Zi+eiKmJLydCCDH++60VTjO5qpGqAgHnvhA2mn2ybqP95XaU2+fVC7jwHy2Ry1QJZW0CZm5c8tXl1zecCgXC0VYwEnC5Z4ipgDkuJ8ZgtItqI7Gdv1eBM4TvP6YsX5OAhRheJh913ulePt5EM3fe/+y8bSSfaq6/P7iZpuSneP9DYyP0/KC2sdM9/TumG6kqELDhN7Jfv4C1qK7T88lFu9QjFgREZabFC2xc8tVl2mTuVaxrukLm8GlrajE6Q+i9VOGXKGDmWcfcvoq9OK8WoNiVXLlYoI+VAgG7JWBtEboFKG3cfF/5RvJdpGvSQuKvoogUqR2/dAYK7GXKMmoscA2UP5orPUNMfUDbej4SbUSqvgglV/YMMYJzWFc9Bgv0sVJcF/D0RHTjt6ABAGCdIBHROC1gi3EwZABA1UAiooGA7cTBkAEAVQOJiAYCthMHQwYAVA0kIhoI2E4cDBkAUDWQiGggYDtxMGQAQNVAIqKBgO3EwZABAFUDiYgGArYTVcicb3nmd1nxYAEoB6MvUpt+BVn15WajPyjOX5Pqu+/Ed+Jf5Du+HBzMvUZAwHZCCFi7hbPXWrm/io77Y309eyjyEzFACFGSg/nbTX9vhPjpD1ULxL6cl4zQXk+YNutg7jUCArYTpoCZf07qar8/+u2ToRietr2oL0Q/kv3FNk8fl/oFsVfy62PPLD1gtoD7kd8+eU1TI+HmU9A8fXz+H+VMMBKG9pehOM3mB0A8lXad70IVlHQkdLPakdCopqtAUwkO5l4jIGA70QqYSC6cpDar3I/8veuJGF/uelE/1U/uf+J8AQH/+bJpnNA5DPYbml94t1XAo6vOCq6E4ijoXk/E+KpTSMDLdF3iCpjv/mW6IAJZcqma7wICXgMQsJ1wBKx6yWTLny8b0/8H+5/jtDCkAv5xc763FQSeH4at+f9qIoQY3ey3wyDw/HCre3aXv9ec8tnk/urj++l/jbLVvZrJ4GnwfXcrCDw/qG3sdM4fxPhXdyOcZaKMoh5PWu3ju/7h7P+8Ohw8jQdf322Gnh/UtvcuZpVlfT1dd+u19MpeCDH+e9LdScYfvv1xVzDYx4ukkaDePOxffJILeHR7kIzTCxofr58SAR/f/uxuJ/8tTPr/7xrFh7tb0/8upn04eEq2Dk/bzdOH+2Rsnauxckpzcd0dJTPs+YE3M+Xo9qC5MZ23kztVF7mjs8hgvx7FQoh+9Pw/uXJhLkDpfYk1KH8FTP+x5BuRDpXeuOTVBgcIeM1AwHayzAo4X1m95fGkNRXwojBkAg7Cd9//jIQQ4ine36n9e5XYZ7DfqM/0dnfYrnWusv8HZHpBOfo7uJ8kXZx3Zv8JaNyrtX4kmyfjh/th8n+Hqm5pPp60gtqbXiLF0fXncKPReJ/sPrk73Em0pOwrG9roohPWo98jIYSYjEZPhYKdxFFjFsJkeLkX+jIBDw7qQft4GufjaCyE6Ed+WHt/NBgJIcQ4PtgK/nsxHf1kePd3NJlvn07F8LTtbTT+8/35v29ThKmIK70CHhzUN6fXK+O7r81g92Ik60J6dFIMT9tTAZsvr7Xamz9QLUmljRQYAHMFnN6iqpnxtLTZZZa5nHAEBLwWIGA7KWUFLIrnKamAUzoc/vhn+rQfBbsXcxuMrzp+6ul8X1lqnr3xPEvx2ZcpAaf09vujX/8yyA9M0VcmtOFZ09+7zjjFONh+FGx9ew7g8fitRMBxFDa+Z5aP/cgPU/P8ePw2lN0ef75TPTxte2+OsnOVD1MVV+pAxFHYuXyaPXu66ATJ02wX0qNTEkZLRpUsM3U4RduX0P3tpNfBhdfxRtfTRg0KCHgtQMB2UsoKWJQr4LRE53YcnjWzw8i9qZnad3z38+P7rXB+L3QqxdHNfrMW7HQOr+5GuS40Y1t8GzW1l6Kvxd2lFwemweaGKnsPODel+cEv1BndHO7+s5m9D5+6kpgiD1Mf1+NJK3v+JGPOdSE7OiVBC0wrNo5j6NOevwLObGQKmP4jZV5G84GA1wwEbCclfg1JmiN0GAn4s+bwzPcdXXWCRvfyIVmYZRP95OHmcLcRhO8SdS0pYGVfSwpYFuwKBDzYb9RaR4PkHnRmBZyeNFWYPAF/vM0HI3G8ELmjUxK0JGhdEReX/OtO0ztJtIDzruWHoB0tZ1lMC7iAiR3MvUZAwHbCvwW9/CJABlvA4s+XjdQdYCnzfRcbGezXJYn+7msjuf+5pICVffFuQZsF+/uj3zxe9Cj7FrRUwIuDHP18pxKwKkxGXIP9erj/Jx+MXMAJ86PDoLAwpE+JytqaxF0i5h8UU8CmQc13VxViAFIg4DUDAdtJAQELxR/YalfAQgxP27W3B3Fyc3IyuosfMm8BP+87OAiDveSTPqPBUWcjnNniTzz9GNFkeL5bSz5FNb7q+O1jSbLnCVjVl3i66ATN47kI0x9WEpP7x1GRYCdx1AinH86aDC8/NwLth7BGw9FELeCni06wdfh3IoSYPF582qkFCgErw5TFNTgINz7fzA/P8KwZNL88B9O/H8u6kB4dBqsTMPOcJyoQbTIdRlit8C1o4k/VVMD5ljmHI4+DudcICNhOpCFrExB/0aDDQMBCPN2d7iVfmPGCxrv93I9ePe/7NDicf4fnajg4CJNEf382/XKOH9bfP3/nZ3i6GwaBF3w4X3jrkfkesKIvIcTwrLMRen74Lmk3/XWd7aPZ15BMg3286O7U/ORrSH/uTtv8ryHJ3wMeXs2/m3Q4eLzoqN4DVoeZjyv5RLcfeMFBsowf3511t5PvZYX19wexVMCyozO5/VwLds91bwkbCVi7XSWwwqc9/w+qgIC1i+NMRJyrCuZ8FhCtCgdzrxEQsJ3QAtZuFIo/12JXwQAUgHOmmZ7Sqqf5x5wlI7936Z3n/NP5RmIlSjSrHYaW0v+6Hcy9RkDAdpIPWWXTApaFhsGqMbJv/j6t6p5tur6qqUw1VZtGf1DSrjk3opjh5DcS2wnomSzwh+9g7jUCArYTB0MGAFQNJCIaCNhOHAwZAFA1kIhoIGA7cTBkAEDVQCKigYDtxMGQAQBVA4mIBgK2EwdDBgBUDSQiGgjYThwMGQBQNZCIaCBgO3EwZABA1UAiooGA7WSlIWu/9U//uEfhLxcW+yaiqqlSqhX7AYTCIeDr1+B14WDuNQICthPpD3Gofk8gIzatIJcRMHP78r8AQMNvjfObJMTsSTcSoWlfNYsTgBfFwdxrBARsJ/R/xsD8PR2mL7X6VG0n5LpS09CTwP8xoHw7mZfoARiNtsCOALw4DuZeIyBgO1lewHmXSO0iXVKrmjVaAUtrLg89Hv4N5Hw7zNsAzF6klSFg8LpwMPcaAQHbCf8WdLqC9LHICUZVU7uWNVoBM+/ZGqE1Ll/A9C7MqKWraiJYCBi8LhzMvUZAwHai+s8Y8v9mKgjy3eJMTeIxvVHLKkzDH7aR9TkCpisLxdwy+wKgsjiYe42AgO2EL2B6GZrfVzDsIr09y18FCp5p+G3mo8s/LWY++qpF2ym/I86rAFQNB3OvERCwnahuQeefEjmdWCJn2iEMqtU20bXRStQIo0b4U0RsX2Y9zXwVgKrhYO41AgK2E+b/B6zarlpH5pvir4ZVC1NisVhgjciE3whtX85U0A1K1+L8GwNlXZEAsAoczL1GQMB2YvQ9YFUjzBWwqr52L2LflxKwas2tmjfOFHGaZQ6V2R0AFcHB3GsEBGwny6yAiV3y240EnFeOkcboURlRygqYeNVoLwgY2IqDudcICNhOigmYWLepmiqwApY6mN6FDqQA6xewdKI4w8AtaPB6cTD3GgEB20mxW9DzLfSt0cwudH1pm8QKmGicc8OWyZoFzLyC0TYF14LXhYO51wgI2E74K2DBMG56l0w17QJa1U5+X3rVSG80hbn01M6JakmqvaTgDIZfE4Bq4mDuNQICthMHQwYAVA0kIhoI2E4cDBkAUDWQiGggYDtxMGQAQNVAIqKBgO3EwZABAFUDiYgGArYTB0MGAFQNJCIaCNhOHAwZAFA1kIhoIGA7cTBkAEDVQCKigYDtxMGQAQBVA4mIhiVgAAAAAJSOXsDlOn/9WBCCKQ6GDACoGkhENBCwnTgYMgCgaiAR0UDAduJgyACAqoFERAMB24mDIQMAqgYSEQ0EbCcOhgwAqBpIRDQQsJ04GDIAoGogEdFAwHbiYMgAgKqBREQDAduJgyEDAKoGEhENBGwnDoYMAKgaSEQ0ELCdvFTInh+8eKecMRQeZ37HAr2vCGbXdDXPD+hCt1NW+Px2ChzuVR+jwgfCaGAveKbxcTD3GgEB20k+ZG1izaTXYhAtMHvnbKc7VYmB7xUj66wtuTPDNG2n8Kv8ARQ45V5EwKX8dfDPEOKBaUemf92rzgNzHMy9Rrgr4OFpe3q2Rf31D0lJ3PNaZ8Olm9EetVV4Ym5KbY/ajEM0pU2m5eZ3QVqHuGgoN5ExbaftkT5GougKmD6gdHfMfue9F5ANvZdqnNozzWj28k3lj0W+GnEi8c8u7XlSIFImFuhjpaxFwHFvdhqF4fbe+f2y7ZlChDA8bS8p4MHhVuf0cXFbP1r824tidnOvVsBEHiEqLClgaXZWVeZs11bm6J/fcoEB5Lfz9a89RsR2ac38cSws4MJjKFCHGfsyWiL2JY6U6mSmD7TpYLShrVrAz4sf0/RoHesS8FQqT/H+jrf59W7ZFs1YqYDjKGhmBZzQjwqcW69TwJwcxxQwc/UgfazqlFAUnQTzA1D1WCwzMjFtimk1uho9Rfl/mZPGGRVzMjnaSMtM2zJTS+O7s+52mFGI0TmWHk++feIBHS99vDihEd0VQyVgRc50jkICjnvepx8n70Mv+O/F4Oe7IKi9/zlMZJaSx/hy19v+cS8WpRL3PL83s9LjRXcnDAIvqDf3f4/KiyqDmYBHvw87OzU/8ILGu8M/49nmcfz13eb0ry45ezLXcZ6fuZudE3Dc86Kru+PdMAi8YOs/l8+n4P3l5+ZG6PlBLQhTcyiZn+Fpu7Z5MJgO9aoTNKL4ySjkBPpv2wjCT9pqqtSQ/9e0u3xrRDV6SEQ1fo4rTIF26MHQs8Hfwjygqo3Sl5iuVe1LjJMzAzx9/j3cbES3IyGEGP36uLHzbfGWnukEcrzLF7D0KUfVqguFJYGAaYoKOGhEt6PrblAL9q7Hvz/67ZOhEKOf75IHQggxOn8fvDsfTetPpTK6iRq1ztVICCEmcdSoR7/HQojJw3ErXN0hMRJwfNy7uJv/dYVTg05+dYP2sezmucEKOO55QbgV/R4LMb79HAbTC5Hx9V5t+yBOJuV6bzZXqvl5PGmF9f0/QowuOuHW9wfTkBNoUzKv5fN/q0Q+XVLA0uygbbPAlT5TwPlOV5TFVINUTYVWaXQFTkTExccyAs6bkmhBGxfRLOex8unwrPm8hBBxNMtyZAv0kUr/QeW3a/+IjHo3iLQMIGCaogJ+c3QvRBwFje8PQvSjqXcn192ZJ0Y/3wV715NZ/elpVP8nurofCyGEmPzq+rMKQojbz17rbEWL4MK3oJ/lOvnVDeqd4z/5EZoJ+O2P2ep2dtUini46QXc+EfOLFWJ+xr+6wc6Xw72a+ma16S3oldoi/5L22jz/lPYQx0ZMQRYWsFE7fJhTKnLpu0CDQhYRoXZm41KXq9RCV8tHyq+sbZmnpT9fNtIr4Mbh3fOwMyHnJ4Eze/TMF9BqBQU8nfyg8W6V9z6rT1EBt86Gz+6ZC1iIuJdYYXT+Yev4IVN/fPs53OzFiYCHZ83MX0IZ731KMRLw6PZgfqvZ81Nyvb/6+L5R88P6+4Ob1EDNBPwc43zSHk9aqWrzOuT8DE/bnl8n3mB+dQLWJgttumcmqfxGaaI0zdFaDczr5MdDwxcwXZlZhx9R3jdE7Hz4B5p5DnPOsfl2uiTVxnc/3m0Enh/UNna6l4/SFohRac+u9QiYE+ny0IloMvpz2Arqh3/L6u7VUbaAxZ8vGzvH948nrQ/PN2ZSt6DP3wdTMY+vOukV3ioxEPD4quPXP15Phy6R62Q0+N6ubczehS1JwB9vZ/1f/ndah5if4Vkz2Du/7IWbz8PI8CJfQ6Kb5QtYmg6MBCztqHDGYQqY2IuuqUWrlvRTbfv8YI161zZu6kvTjZwG6SmiG5w/HV3uNo9Zd1A5s2EqYKJx1VnNPzm1wzZFm4juDhvV+iLoeildwOL+eKf+/sNW99ckV18IMYl74fTW9OiiE27t90erd7CBgIdnTX/r8E4IMRne9v4JJHIdXX8OUwIenra91g/Zu8NMAYvBfj389HssxPju6N2bRji7WFHMz+NxK+xcjoR4uu6G9ag/Ngw54QUFnP9r5ySLJQVMby9FwLTUVy1g7VRwXuVcr9Dt8AVMtMC8Qipm9MKXCPOncRT851Lyycd8CERTxJ9Dvh2+gFXjobe8lIBHgx+djbB7TU2m3ZQvYDH6+c5PvakpMuJ5ON6eWW389yT5lG/mZm/ZyIJ8PGkt/oVPNfw0OGwnHzze6p4d/jsbVfqrzK3PF2nfjv8edxq1hUYU3wNWCFiM/xy26jU/DFtfB3dnzXkdyfw8xVHDa83eSB5ddYL6x9ulPgVdLtrspu2XI2Bi9UC0pm2BMyS+VlULFG132jEU693opXzIxFHgNF7YDfyN/MuUYj6bP53cfg7nf93B811o1YUXMTC6U/os5Z9L2olar4DnuTesv909vHX5LeBVfA/4/sdWsKZ7y0wc/DWWygqY04J09aNKTMxVAr3O0A5JVbmYAosh7bpAL0ai4hwFbeP0IDnZX7WRKPl9MxuLaWkS9xqdn88fAhlddYP2SU4ixDmZGQDz+kDaAqdavuZLCxg8U7aAx3+/rfILRcVw8CSopoC1RdqCVLf57oiVRz7z8hdPdE2pqOhrglKQRsTsnTMq6VEgxEb0bnR9I32qisVIVITCtU2lx5C7//zw7U37ZKi/Fsx3SoyQPx4a4qgt2TITB3OvESUK+PGklf3xiorg4EngYMgArIH7452wezVM7vAlH8ncln4EBAiBRKTD3f+MwW4cDBmAtTC62f9QTz6ZETTeffp5V7UFR5VAIqKBgO3EwZABAFUDiYgGArYTB0MGAFQNJCIaCNhOHAwZAFA1kIhoIGA7cTBkAEDVQCKigYDtxMGQAQBVA4mIBgK2kxK/B/x/0V36cb6YNsLZrq2m3TEz7MJdF+uxQM0S2+ej/U2Gwq+W+2sP/O9tMwej7QKUgoO51wgI2E7K/SGOTOqfP1Vt17ag2qjtSNU1PRi6Mv+SglZgemx0g9KhSqvRhRgMk3IFLEwUqP0tEaLfJQVM/KwHNFwuDuZeIyBgO8mHTPxekvYXfFRu4NSkW9B6JS0no0UtUZm/7OYUbRda/WciXfJuAQf+yWB62hj9OpXIaU/6+1lSedO9FxintOtn7o+2to/wgxumOJh7jYCA7YQOufBlPt+X/EUbrS5CePk2Ob0Ta+jC0At0IiLtvtJeSsRoBWx605jjP62ApdcE+VHR1Thh6qKbxFG9aj+yW30czL1GQMB2QoS8zFtxfFuodhSGK8t0fWIY2h7pCtrBay87VAtizko9s8rXXkbQFzRG8D1kdMtE20Vmd86D+Y5E+6ZXlma3ggYH6f+HFHBwMPcaAQHbSVkC1nqFuVxjKlC1xXSxKHQClq6kCb9qxyntkTM5qqC0FxDE9tJROSlvx2JLar6AtWPIDIZ5rcC7mPjzZWPrG25Dm+Bg7jUCArYTVcj5RMNZNNC6yryU30swHEbfvM30ImRK5veuWjsSntMuPaXh0EYnVrralqUQ6znpopNTTej+NyHVFq0CpfImFseCYWWm0aWDYTh4ct0NOpfu/u/xBXAw9xoBAduJNOR0JjVaIvBXwBwF5k1JC5KQpVZ7ebERa9PCC0r+5cX8KX9VTYu/FGiPzh9wzhnmClglY22/xC7zynSD0r0y/6qIowBvAxvhYO41AgK2E+mnoDMPpE+lFBMwvZ1es2bqqCoX0D8xTs4A6NW/dlqkgXAUy18HF6Asj/K3ZJzKWbmqHmcuKKVdaNffqh4zQMCmOJh7jYCA7aTcD2FJTcO5X6rdzqkgtdraBFx4zCoZ57fQtwq0+l+e0gXMubMtbYcvYOlGZjvFOhJC3HyCgM1wMPcaAQHbyeoErHogfcrZTq+DOctK6ZZyBaxa+EqDmr8kvUogthj5fv0CLvEWtKrOmgWsXV4v8vDtTRjF2mjAMw7mXiMgYDtZj4A5K2DVQlm1UTUAvsbyL5UiYE4veY8yO+Js5Ii/GNK3UYk6xEb6Zq+q8guugOnGh6dNb/7Vo+FZM9i7nqiiARIczL1GQMB2QgvY6A4hZ3FmWjOzF31DlRCb9qY0PVTtRuYKWLWIX3IFzLxTvTxGi1R6o9FiOr8lfypqz0+VgIlzO7/85XD/fSfc/2O0C3Aw9xoBAdsJfwVMw3xL0rQm841M1Qpba2Ki93xc6V2I8LVjy+ySH5K0I9VTaUTMsZlSQMD0e7pLNi54K2Cpp00b5F6Jjq46wd71WBsKWMDB3GsEBGwnDoYMwAqZPI1x89kcJCIaCNhOHAwZAFA1kIhoIGA7cTBkAEDVQCKigYDtxMGQAQBVA4mIBgK2EwdDBgBUDSQiGgjYThwMGQBQNZCIaCBgO3EwZABA1UAiooGA7cTBkAEAVQOJiMYVAQMAAABVIy8sCwX80kNYNw6GDACoGkhENBCwnTgYMgCgaiAR0UDAduJgyACAqoFERAMB24mDIQMAqgYSEQ0EbCcOhgwAqBpIRDQQsJ04GDIAoGogEdFAwHbiYMgAgKqBREQDAduJgyEDAKoGEhENBGwnDoYMAKgaSEQ0ELCdqEL2/ED7WEVSh6jJaaRY5Rdp0LQj0wHw6xMzX3gwqxut0b6eH6z6wGXap7tb21nkCA7mXiMgYDtZnYDpyqZSKRFtYqULXZPTkem0FJir/C4vImDtZGonTVqHPxKj3vkCpmMsMFTgYO41AgK2E62AOUlTte+SdUxrEi2YaoDTu1Zy2jlkanv5ufIYK+PMeIhx0pNW7NxQdVe6z/gHtPAlCyiAPBHFPc9vnwzF8LTt+b1YUuPxpBVE2RceL/7dOxlO1BUoRue7ndNHqkbc81pnQ+4IywECtpN8yNKEm35VWpO2yypqFsN03wICls4bfwzaeaBflc5SfkjEIInLCOkDuvcCg+TMYWFUFw309K5hYI5TnoCf4qhRj/pjZQUd43602YjiJ2UFCHhFWBCCKcVWwHSbBaRF1F/SuERfnGY5seSFlN93mYsJfvgqu+SfqkTC1L9pd0ZPVVZeHs6lT/4pJ0ywJPJENDxr+nvXEyHinvfm6F5SI+vXSdyrbx4M1BVY3B9tBXvXY8WraQHrR1gOLgv44by7EwZJAkpd49xffWzVa37gBTud73+mByt9bEQ/8tsnQyGEiKOgefr37vS/jSCobbQPB/PLq6e7072tjTDJbvMTZTz4+m4z9Pygtr13cqe+FlsajoBVL6koS8DpdFxKvmMKmCkAIwFz+tV2VKCmdgzaOVGFqWo83yBnBUzI3uhihUDbAl/A9LDh5gKY6WPc/9bZqfmB54e1IO3X0fn7sHudTpiPJ63g4/nvL616zQ9q2wfxglb7kS/V8+S6G24dP6Q33V9+bm6Enh/UgjCV5NeEuwK+P94JP/3OXgxN+tFGo3v5KIQQo9/RZti5HAlBCTjcbDSi32MhRqcf5nWGx+3a24N4tNj48KwZtI/vhRBidNurb/TiSWkxZpCGTGTATH5RJVOiR/76plwB5zPjegSsNVB+qvO9SB3AnHm6pipYpiy1M2b0VDp4Zk1OO8xLB7qySrHw7jKY6OPh23a9c/owSR6/TRl0vh595vGkFXhB+9vdkxBPN1Gj1v2Vel0lYCHiXi21oh1f79W2p4l6cr0HAa8ElYC97d7NcOGoji93vfc/595MDslIUAKuLdy1SFbS/SiofxmIDPfftxrf5xdfj8dvQ+NbKGwIAQtFrtFuKUXAtCpMybicXrJorzDoEXKyPCdwVS+cykQ4RLPa2aD35QyJ3zjdrBGcCwWxeLbTlxcQcOkY6GNwED6rcfEO80L6fa7w8Ta170b6BrVawAsuf7roBN252CW9rBx3BSzEU/x9d2sjrG3sdE//Jkvh4Wnbi/rPVeaHhLoFnftk3eisOauQJo6yelingPMWoXUleBogulBVoB+nNzKVzxznkpcIhDNMl4yFdaVtUDtI4ribCpguRDV6nEw488m8wFK1Q49Qe34CYaSPhRy7IODhaVsq4MUlci+W5djcSD9wYQAAA0xJREFUR6ieszdD8yvHZQFPmdxfdTeDzuWTSFbAnavx7KXnp+ljM776Dy1g0Y/8rW+5N+4H+/XUCni1cL4HrNpSrLJpa8ynnBz3sgLOJGLVVQgdkamShSIcQqL8LpgeYs6ntAJtwcKtccZWioCXv4BwBDMBv/0x89/fwzcpNd5+1gh48cYytQIenTX9z7MxLSyjx5f/hYBXgiaEycNxaypgMbrqBI3odiTE9D3g6Tv/g4Mw2LsYCzH++60VehoBT+KoXmsdDTLvAQ8O6hu7J3cre+M3BS1g7cIlXVm6hchK2oSlXYFpO1I1Tu9SQBjajMx0G90gpwXisoBvdPq4q06DwkHl69AXCvMtnAb5W1THCwJeAwb6GF91/OQjMo8X3WZ9U/8ecPdyIsQ0Jy/mYfI94JRlB/v15JNA47ujd28aIQS8CmQhPJ60Zukm2Ol8n3+9TIzvzrrboecHtY32x8v5gvUp3t+p+UFto30YX33UCFgIMbrZ/1APsreaR7cHyaegPcm9kTJhroC1VshnZE7yKmBNVe/advJNLS9gumbefPk5YSZ3YgDamaej5hs9v4XvIaE7TMR1Q4G+tL1oX80LWHtWFAscJBjpY3i5txUEXrDTvXy8idIGfTjenn0edspTvP+hkXx6OfUe4gz2p6DHfw5b9Zofhq2vg7uzJgS8CiwIwZRlfoqSXgmJXOqR1iywjikMsbDjxKsdGEdm9EbOSlEYzjzfuNLel5dcZjBMExOPiw1Muwshe+IMWWY8YE5ZuXcS98LNpb82cn+0tcrvnhQAArYTzi3o/Ev8XEO0w2yzXAFrK3CKqimtZoxWYNoLBW0sqtakg1y+d+mlDH2JwByP9ikT7WDoOsRgjA4NyFNe7s38EpY52l/CegkgYDtxMGQAQNUoNRE9nnR2898uYTI6331H/xb0SwAB24mDIQMAqgYSEQ0EbCcOhgwAqBpIRDQQsJ04GDIAoGogEdFAwHbiYMgAgKqBREQDAduJgyEDAKoGEhENBGwnDoYMAKgaSEQ0ELCdOBgyAKBqIBHRQMB24mDIAICqgUREwxIwAAAAAEpHI2AAAAAArAcIGAAAAHgBIGAAAADgBYCAAQAAgBcAAgYAAABegP8POswHdI198VEAAAAASUVORK5CYII=" alt="" />

5.正则表达式标志

aaarticlea/png;base64,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" alt="" />

var re = /\w+\s/g;//表达式一
var re = new RegExp("\\w+\\s", "g");//表达式二
var str = "fee fi fo fum";
var myArray = str.match(re);
console.log(myArray);

表达式一和表达式二返回的结果是一样的。都是下面的那个数组:

aaarticlea/png;base64,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" alt="" />

二、PHP

下面的示例代码可以在ideone中查看到。

1.创建正则表达式

$regex = '/\d/i';

与JavaScript中的第一个方式有点像,只是这里的话是个字符串。

2.正则表达式中的特殊字符

特殊字符有:   . \ + * ? [ ^ ] $ ( ) { } = ! < > | : -

3.正则表达式中的函数

有个方法,preg_match与preg_match_all,preg_replace与preg_replace_callback,preg_grep、preg_split、preg_last_error和preg_quote。

preg_match

执行一个正则表达式匹配

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" 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返回 pattern 的匹配次数。 它的值将是0次(不匹配)或1次,因为preg_match()在第一次匹配后,将会停止搜索。

$subject = "dd133aa2";
$pattern = '/\d+/';
preg_match($pattern, $subject, $matches, PREG_OFFSET_CAPTURE);
print_r($matches);

上面的示例代码加了参数“PREG_OFFSET_CAPTURE”,这样的话,在$matches中会多一个偏移数。例如下面的“2”

aaarticlea/png;base64,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" alt="" />

preg_match_all

执行一个“全局”正则表达式匹配

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" alt="" />

返回完整匹配次数(可能是0),或者如果发生错误返回FALSE。

下面的代码中$subject和$pattern与上面的都一样,唯一不同的是preg_match换成了preg_match_all。

preg_match_all($pattern, $subject, $matches, PREG_OFFSET_CAPTURE);
print_r($matches);

返回的次数是2,匹配到了两次,再看看数组$matches中的输入,有两个。比上面的多了一个。

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAOQAAAEbCAIAAABFhr+iAAAHLElEQVR4nO3dUZKqOhiFUec/pTOpOwPuQ1tWVwshYv7IxrWebA4gp/rrVEDR23///ffv378FTu8mVlLsxHq73WYeDTSIlRitWH9K1Ssn8Vqst9vtsXDrwe81f//T82N4ycsj63Nqq0saO1Eqx+zE2g5xa8nq5iYVvGkz1q2xsDPWP40uYuVtJbH2bwv91mPdPT36PV5uzRZWVy7/D3Fd817BUipvmhGry1UM4b0BxBArMcRKjK5YTTc5g/1YlcpJiJUY3s9KDLESQ6zEECsxxEoMVwOIIVZieAWLGN4bQAyxEkOsxBArMabGunt/ixtgaJgd6/OSns/ROLbzUStzEp+MdfjHC/RvKNZEl4q1c1ufDRMqL9bbk/azbB3Gn8/p+P2gvXD1R7PtCfJiPfBEq//65xm35tPtIxx72LRdMNaekbUR4u7C1W2VOkFerO1pQOcc4M/jzlgbA6pYJ8iLtX//u+u8FGvjCJU6x3ddZ109JVodpHcXmq3O5xWsd2UdbTTvDTgu8U8rmliJIVZiiJUY8bGaMn6P7FiV+lXESozgWJX6bcRKDLESQ6zEECsxgmNd9PplxEqM7FgXvX6T+Fj5HmIlhliJIVZiiPXukveHXYxY7z5+5+2bT/ENxHrX+SkBh0vq31CsW8R6Vx1r57aPzzQ4/CwXJta7IbE2PjWjZ/PlKdbHTn7vrbFw9cfLzLbFejdhZO3Zw/PIuhX97hGOPewzEOvdnFh7RtZGiLsLV7e9RqmLWB8mTAM65wB/HnfG2hhQxXo11SNrz4aHY20c4WVKXcT6sDUvHPK77yz1+ZRodZDeXXi92eoPsd6tpvnSCieUdbS7xHpNiX9au8RKDLESQ6zEEGuhi00ZP06sVZQ6nFiriHU4sZZQagWxlhBrBbGWEGsFsZYQawWxlhBrBbFW0etwYq0i1uHEWkivY4mVGGIlhliJIVZiiDXAJe8PO0CsAT5+5+3WyluHUfSXI9YAjSiH3HXduWHjJu/H49K7wMUaoDrW/m23VltdLtZvNCTW25P2s/QcyfI03DYWvk+sASaMrJ17MLKyY06sx0bWxnKxfqMJ0wBzVsY4ydWAnqd2NeDbneQ66/OTbh2GE6zvtfvrr+vjVMRKDLESQ6zEECsxxBrACdYPsQbovOQ+/9LVZGIN0PlOkdIXBUqv9ncSa4DSkbVzW7HSZUis7fcG7G5+bM2xxBpgwsjavwdzVlrmxHryUhexRpgwDTh/qYtYI1SPrBGlLmKNsHXp6sDo2LPzrdUaJ2dziDWAV7B+iJUYYiWGWIkhVmKIdbDLn+V8kFjH02sRsY4n1iJiLaHXCmItIdYKYi0h1gpiLSHWCmItIdYKYh1PqUXEOp5Yi4h1MKXWESsxxEoMsRJDrMQQKzHESgyxEkOsxBArMcRKDLESQ6zEECsxxEoMsRJDrMQQKzHESgyxEkOsdz4K/fzEelf6jSgvbeXvYYtY77a+EWV3tcP7f3/NbyPWuwnf4tf/dVN6XSXWuwnf4re7+fIU62Mnv/fWWLj642Vm22K9mzCy9uzheWTdiv7POs+Pt1bIJda7ObH2jKyNEHcXrm57jVIXsT5MmAZ0zgH+PH71wMR6fdUja8+Gh2NtjMSXKXUR68PWvHDI776z1OdTotVBenfh9WarP8R6t5rmSyucUNbR7hLrNSX+ae0SKzHESgyxEkOshS42Zfw4sVZR6nBirSLW4cRaQqkVxFpCrBXEWkKsFcRaQqwVxFpCrBXEWkWvw4m1iliHE2shvY4lVmKIlRhiJYZYiSHWAJe8P+wAsQb4+J23jSedSawBOj8l4HBGnXeKv/9EbxJrgOpYe7YVK12GxNr41IyezY+tOZZYA0wYWfv3YM5Ky5xYT17qItYIE6YB5y91EWuEs10N+BSxBjjDddb2ydkcYg2wm8jHL9fPIVZiiJUYYiWGWIkh1gBOsH6INcBqhe+8uH9gK5eu6LJ1nXV3tcP7b6zjvQG0lI6sr24rVlqGxNp+b8Du5q+uVkGsASaMrJ17+Ow5nFgDzIn1/G9nEWuACdOA888BFrFGqB5ZI86uFrFG2Lp0dWx03N35qJWHE2sAr2D9ECsxxEoMsRJDrMQQ62CXP8v5ILGOp9ciYh1PrEXEWkKvFcRaQqwVxFpCrBXEWkKsFcRaQqwVxDqeUouIdTyxFhHrYEqtI1ZiiJUYYiWGWIkhVmKIlRhiJYZYiSFWYoiVGGIlhliJIVZiiJUYYiWGWIkhVmKIlRhiJUZkrO5z+k6RsS56/UpiJUZqrItev49YiSFWYoiVGGIlRmqsSv1CYiVGZKxK/U6RsfKdxEoMsRJDrMQQKzHESgyxEkOsxBArMcRKDLESQ6zEECsxxEoMsRJDrMQQKzHESgyxEmMzVvc5cTatkVWvnIpYibEzZ9Ur5yFWYoiVGGIlhliJ4WoAMcRKDK9gEcN7A4jxP2Ae1HV8s/qtAAAAAElFTkSuQmCC" alt="" />

preg_replace

执行一个正则表达式的搜索和替换

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" alt="" />

如果subject是一个数组, preg_replace()返回一个数组, 其他情况下返回一个字符串。

如果匹配被查找到,替换后的subject被返回,其他情况下 返回没有改变的 subject。如果发生错误,返回 NULL。

在代码中$subject是一个数组,里面有两组字符串,接下来是将多个数字替换为大写的“Z”。

$subject = array("dd133aa2", "kk1ff3");
$pattern = '/\d+/';
$result = preg_replace($pattern, 'Z', $subject);
print_r($result);

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIIAAABTCAIAAADcA0ggAAACYklEQVR4nO2cW7KDIBAF2f+Wsil34P1IVcoLM8OIQY+m+8saecUGBGNSlmVZluX1eq1wHQUNCqBBgr6GUsqZDfpN0CBBR8PbASZms1tDKeUT9A62Kben2mN4MzIa2otoRoJCcFDR1xBfYi9iZmeK84g0eP03qaG6+isafGZpyOeFNdDQvcFu+7g3d5mJp3+mG3LqLhoHHidpYJEawzMlCdAgARokyGpgWp9KSgMOZoMGCfi+QQI0SIAGCdAgARokYKUkARokYBctAc+UJECDBGiQAA0SnK2h+23ob35deoGGNpJ5I22s8G56822SqmF7u8VAxos1eK8wDY+GARNeZPilnoGMT9OwN2+g4XhjHq6hNMS1xCV4Ea/B3lR2ZF69pYaBiuJKg6q7LfzKR3imhu5gqo6TGj6RzIB4voZ4UsrMSNVxvhnxIDDPZrilhnz53TRJDUGyr/j40X1DO5gykWQwGKlue9hFK8AzJQnQIAEaJECDBNyiJbh+wWoG5y1YzcWx1ypz3Wl2lO5Kt9OqyzWYbR0eDUkTmVzF2oJlgmaaTpMu12AGj0xK3bx7qzOveCb7wzV0d6qZy1pNI1WkLcqsMWjGrp50Sw3DFVWnggOvnPxoQEN2NAQRryg0/Dt7ZDZoc+Unt0nd6JYa9pbvpelOSplZywzG6Y0SLtdw/P62K9e2unZIxbdfc/y1wWCkuq1iF60Az5QkQIMEaJAADRJk/2sPppL6H1aYDRok4OfpEqBBAjRIgAYJ0CABKyUJ0CABu2gJeKYkARokQIMEaJAADRKgQQI0SIAGCdAgARok+ANqrhjNntruWQAAAABJRU5ErkJggg==" alt="" />

preg_replace_callback

执行一个正则表达式搜索并且使用一个“回调”进行替换

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wFHSmby2+UxcJQO5WNhuYb78v73xOt3f/l+x8n5Vmxel6dBuZRSql36+u5HhDhJxyq6Yz9fFzNDarZDXK9I1kEGdv7m+9TdGWshp3sVWdjWRa6L/gelb0jAjT+9eZ1ILL3sjGkYy0q9soBjWObcPDdSMgLn3jHgNb2s1jeZLb6dsi8Ms73avhVq7DcsLI+BoyM1Ew+m4b78efpb4rfTP30Fwrpz6r0Ss1607GMmnF0gLDu/b8QWhi/fPSjEdJLOtCk1bl7ywtniOOB+7FyFN1kCbsHYXFUx+Rrb2Pxj4L5Wj2d9r774CLiAPXnCqgJOV3xXEqeMiOEkkGrods0ozOfOsFEB5+00W8KPE3CuHXn29grnbVKt7k2KNFYzk9151tzm7HbUe20pW7PnXbW65+xCHTSv+OiyXaiTTVj927Ok6xXK2RDnvEVNZ3Vm0vcNnpdKvaAvxJQu7itx/cq4SU7yZgw7FTlTsTqDmuGFSPKqNd3ENHtHh1rd5SVJ1Ymha+rQdB413Zl7KER40TnJ01p5coqjNl6lqurYPwM+MJ7mlwFGnh3IdZGLl+t9Qoyh2iP+NaCKM9u7dniBm+wjuW/EXMVpidIry1fuHuwCTQnWGtzyg+C2ZvPkuhixd6HqaqW077cL9aGVEyKHJVnVtbcSX1TdtadXJM7ZU2bt4LZjANTqzC7XqBDh3aeKm62sELE2jRrDTnswbb5xJ+20O+mrrZ71iSbGhT1rr6uha0otfanO7UJd6HRrCLhP/0kkEonE0X+XaW2WYSwptadl2p/UT4TdbHtgENLXtCWWqcspwWlWXa2U9tzLrk51xS413SB6Txus3Df9Wnw7ZWcOs77DgrWpyN7hqGtyRhK7D3RumrxvxHhhL6f6D7b/vD9NJBKJxB8f/K6+859TXRsDZ4zza/1E2HUyoFck1/4blp1bmxmtMwc0OSP67kIdyilrA+9IyQnpmiZnnIui7hsvD0ul9pAYhOj9alacLuz1XbvX9XZ6ehTDUmObVsU0S2xjY7WRxaB44di8rjU1/0UjHwEXuCe7dqE6u0rHlC4VcPZ24ba1FbulMjJqtuUdq7C9eixZbzWvDuY2jHvOYq5dqPZWfcdVuLqxUUqtxnUOu+jdqoFXDn+cgFs8jEWS7ykd34mu2YtSaiplV6AS8/Qy95lYWre+v2wXqlRxfd+pqIUIBvdDWEmPOqK1RcX+48Uld/a5D4nxCGTxPqJJzfDCq8vJmTZluTe3ZDTSikUr+vhFyn6NnuxjepGSlb45qBRfTKX919ZliXkOnEcG/PF+mm8GvPM8eaCSs2t1L9dxDpWQJMWrBia7hKIXyeIdMdSzw2mVmr2bjHWaEfscOKp30nFhL3frt7zx5f1pADfqFm1+pF5akeCFmHg7UMq+a+zTh3D24Vt2s+oViUteyc5Za66Tqx4GNaePnNQ7BunkxZkpZ3QnTe2kobnelCeHMkaiF8m3zglSrvOr9o6nG+vYnW4dF+pf/32dSCTyH5e/t3sbxtJSe1img97JHAocL3DRQsaaz5mWqcspIVOzz9maiWSaZq+edA6QmzkkMmjfZLb4lsrelrlUTfEaZv2HBb1ZSzqPYpwDR81ePcYLsbe+71zfm38kEol/v/s/vy/5zqmL5xpai9O1yRkiFoNS0nWSCMPOJ/0lEpXE5lDJ+q7AjfWWONnnUTjINpyb0IhakyfHju4dy9XpRDBSL+1efJBtqGoj5hJw/sZGKfUIjmQbm2cbOTjH3Xkd8jeHnws1aE9eDDu06nWZgKP0/mZ6mF2ePWlPD73jhZ14UZw/pd9jFluY4qfB+qsa24SJwtmJF8+8W9CDcN7E4M+PPCnevG+n4zNbIjbERu8hAGvx5cMfR0f55j9PnY9H4HmQ7890xv2n/ySe95UZ28b7IN9fgX/enyYSp38+29vvArGJy+wDMahIEb68/cvsmQLuufVkxkG+zxwIOH80KSlKM6EJppKdPdNkM0DAPQu+vD/97fWbz9sd5jbIzy7g/nr3Olis4i/DLyvgxs18IpFvhrarWmxDwI2HLVHa4cWzZcdhbpzueWLC3DFNz64nQ8A9FzYp4MxWdhLxQIgxVCvlPV5M/e6xmTz4zn8vnlDAeW4p917m/RX49s0vpuaZY97fde5nYod+KgH37UN2mc/sV2OxxX8RPr85CuRKf96Q3q22gRvDGIzVs8NChBcCh8psOv3v3yZ8n2mq59eTx8NOdxi6jvQoAcee9bf0550tY6jpm3vVGPXl7MXeNNZErqrEjqv0/gu20WEeMujpS28m+UGYvsV5mjw9V56pzbMx7weD9UwytDx5Gz1tiwM3v3bzPeW0ArbAz7gCBwAAAADwUwMBBwAAAAAQMiDgAAAAAABCBgQcAAAAAEDIgIADAAAAAAgZEHBPiqGW3qp+1wMAAAAAACwAAfekhPPwwEcw/vTm9z8++F4/DQAAAIBlhFXAfXn/++SIZ+ZlHYEwu1eMy3+3QGgEHLu+fQ7b9n7Shz+OjqDhAAAAgMfwrASccSelhGBn/395/3si3/Q64nlVzO7VflSUVhNwZsDDEae3R79Izd37SzSlnk4VInwhlq1Vn8qPOg56xKt9pvbnd/+eE3DOYdvNfDABR4NeGw8AAAAAFs9FwD3oirzPC/uHYnABF1AubJzAt16ZbXmXl0qqTgxdLRZfnNw4Es7s5EUuKmXE8v6hXCqW+ahwcKlt+bz8dS5Z+vL+d8aKZ/c8sICj9Mv//P7MLlIBAAAAwsTzEHBm92o3KkldEvge01AIuE5O4HJeS3vGTZIX0oo5daGO9A3e/hWQJxRwdPwxnzh682mltAEAAABg8zwEHKUP1PJJblXAteXJhXWxilvIqBlekvt6S5Re8ALHF5LFvkmp17XvF34313dyApe79fhAV2K8kGkyYuDGekssWrevvkiWpObk85FWsR2yO4dluecovrk6c/1Tr0hc7paojfSh9StZ0edLbv955nORTQk4Om7mE4n/QMEBAAAA6/BcBJzDVgXceEQMQgytlFwUcIW9w4tMra8bZHBd3uUlS6iZI0KMdpoX0kqAm+vN7tUefyF2F+PbvtZPBC5ekq9r/LyA06vHQiR51eoTYuiacsVnO1Yag7cSFy/JtkNWijh5WiLg4uLBca3TJ0TXpJQQsVYExyNiELV4wSXrqnVp/eghUJVtTMDRv969fuT2EwAAAOCX5ZEC7r4Rm1vJCSS/2DyFC1WXU4sCTnilTHyat7M+08AuVEqp3r468Kyh8aCavdjhBY4Xk5e3urMnwmyWI3yxaiw8aNxJz+Tpa/XYUWP+Au6wpjmfDN5euH2mT+lCtZ70+t1fK6UOAAAAAErp41fgTGIt4Ez//EK59Io0q2WkeQ/k8xFwbMUWWMANKsWdeLna0626UbICl23P1FC/zsfF/ajAxUv1e0opVcWCt6jq1fdna0srivY3/QUcW7E9vYDDVlQAAABgLbbsQrWdllO1N++B/IkEnHGT5EWpN/0Pjz0NVgzcuC8lhUi2Y/qEzbXlObmrVyQuetWhYRZwcKECAAAAawEX6g8TcAtFYQo4y7kZr6qUdvKCt6hSq7s/1wrcx/NE4vzjSokDAAAAwGK7LtTlbELAffnz9LfEb6d/Bl3dWVXA3Z1ZW0iX0Kvvz0azuQTciFj/7wg4VSxwx4q+LAYurUxWLL9Wj4VdUaN0oc6aqwi4ZGOwtCBuNibgPr05SmQ/fFspcQAAAABYPJddqA+mpf+UMseXFYMQg/heduAj4P55f5pIJBKJPz58X5KoaxcqX9SIQYjt0vUXcGYrK0SO66pOiDHstAesjah69ViIHFc7fUIMMmjXXkZtnWi25R1efFXR9F49lqy3mlcHvJC8/koppXQoT3ehkkHzKpaxj/9VRXFuF2rVWpDr1w8mi3N6Ox0XAgo42q8f8GJaGRKD6L1b1edAlAkbEnDfm/lEIv/xUVdoAAAAAL8uz0XAqZl5V6y/l9JvBe57849EIshB/4unodnyZpnPdHQnHRd2eIHjCwcnDY2pQ0b9as46Sk7YiRfF6YlulKiNdLIQ8frI/avZc+BIp1iyL+ZKus6BoyP10j6w7iDbUNVGLKCAo3Rw7RwsFy+eNb8uq7ANCbjv3XMsvwEAAACP4LkIuFXxE3D/vD9NJE7/DIM+CM1l9g4bEHBf3p8mjs67y5ZHAQAAAMAkzALOYU5QjJv5RCLfDIV7LjQCjl3f3fPJBwEE3PeP+d+O8s1/fmBWAQAAgJ+fsAo4Ov7+zeH7rFb7/OYoNOFV42GnO9zyHfbrwaxv1wfzLeHJ9+9YewMAAAAeSWgFHAAAAADArwoEHAAAAABAyICAAwAAAAAIGRBwAAAAAAAhAwIOAAAAACBkQMABAAAAAIQMCDgAAAAAgJABAQcAAAAAEDIg4AAAAAAAQgYEHAAAAABAyICAAwAAAAAIGRBwAAAAAAAhAwIOAAAAACBkQMABAAAAAIQMpoD7/PmzaZpPnT0AAAAAADCDaZq9Xs9bwP3999+9Xu9/AQAAAADAc+Lz589///23t4ADAAAAAAChAAIOAAAAACBkQMABAAAAAIQMCDgAAAAAgJABAQcAAAAAEDIg4AAAAAAAQsb/A68iTrmnvin4AAAAAElFTkSuQmCC" alt="" />

这个函数的行为除了可以指定一个callback替代replacement进行替换 字符串的计算,其他方面等同于 preg_replace(),包括返回的结果。

下面的代码也是替换成大写的“Z”,回调函数中每次$matches中的内容就是代码中注释的部分,第一次是133,第二次是2。

$subject = "dd133aa2";
$pattern = '/\d+/';
$result = preg_replace_callback($pattern, function($matches) {
//$matches [0] => 133
//$matches [0] => 2
return 'Z';
}, $subject);
print_r($result);

preg_grep

返回匹配模式的数组条目

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" alt="" />

返回使用input中key做索引的数组。

下面的示例代码中,在$subject数组中我加了个“ddsdfd”,里面没有包含数字,在做匹配的时候,就把这个没数字的给过滤掉了。

而$result2打印出来的正好相反,是把过滤的打印出来了,但是key还是为2,并不是0。

$subject = array("dd133aa2", "kk1ff3", "ddsdfd");
$pattern = '/\d+/';
$result = preg_grep($pattern, $subject);
$result2 = preg_grep($pattern, $subject, PREG_GREP_INVERT);
print_r($result);
print_r($result2);

aaarticlea/png;base64,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" alt="" />

preg_split

通过一个正则表达式分隔字符串

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" alt="" />

返回一个使用 pattern 边界分隔 subject 后得到 的子串组成的数组。

下面代码中,我将$pattern中的表达式加了括号,为了在$result2中捕获到。

$subject = "dd133aa2cc";
$pattern = '/(\d+)/';
$result = preg_split($pattern, $subject);
$result2 = preg_split($pattern, $subject, null, PREG_SPLIT_DELIM_CAPTURE);
print_r($result);
print_r($result2);

aaarticlea/png;base64,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" alt="" />

preg_last_error

返回最后一个PCRE正则执行产生的错误代码

preg_match('/(?:\D+|<\d+>)*[!?]/', 'foobar foobar foobar');
$result = preg_last_error();//PREG_BACKTRACK_LIMIT_ERROR 调用回溯限制超出
print_r($result);

preg_quote

转义正则表达式字符

aaarticlea/png;base64,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" alt="" />

返回转义后的字符串。

下面的代码中,$subject中有两个需要转义的字符,“.”和“?”。

将$result打印出后是“dd\.a\?a2cc”,而在$result2中,多加了个参数“a”,这样的话“a”也会被转义,“dd\.\a\?\a2cc”

$subject = "dd.a?a2cc";
$result = preg_quote($subject);
$result2 = preg_quote($subject, 'a');
print_r($result);
print_r($result2);

4.模式修正符

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" alt="" />

参考资料:

https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Regular_Expressions   创建一个正则表达式

http://www.5idev.com/p-php_regular_syntax_2.shtml   PHP 正则表达式语法

https://www.ibm.com/developerworks/cn/opensource/os-php-regex1/   掌握 PHP 中的正则表达式

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