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Simple regular expression for a decimal with a precision of 2?可能重复:一个精度为2的小数的简单正则表达式?
i want to know regular expression that would allow only integers and decimal numbers of any length starting from 0 to infinity in javascript. can any one help me in getting that done
我想知道正则表达式，它只允许在javascript中从0到∞的任何长度的整数和小数。有人能帮我完成吗
2 个解决方案
#1
35
This code would do :
这段代码可以做到:
var str = "1.2"
var regexp = /^[0-9]+([,.][0-9]+)?$/g;
var result = regexp.test(str);
alert(result);
Where:
地点:
- str is the string you want to test
- str是要测试的字符串
- regexp is what you're testing the string with (built like:
/pattern/modifiers) - regexp是您正在测试的字符串(如:/模式/修饰符)
- result is a boolean, true if it matches, false otherwise
- 结果为布尔值，如果匹配为真，则为假
You should check this link about the RegExp object in JavaScript: http://www.w3schools.com/jsref/jsref_obj_regexp.asp
您应该在JavaScript中检查关于RegExp对象的链接:http://www.w3schools.com/jsref/jsref_obj_regexp.asp
About the regexp itself :
关于regexp本身:
-
^: start of the string - ^:字符串的开始
-
[0-9]+: at least one digit - [0-9]+:至少一位
-
[,.]: dot or comma - (,。点或逗号
-
[0-9]+: same as above - [0-9]+:和上面一样
-
(xxxxx)?: the expression inside the parenthesis can be present or not - (xxxxx)?:括号内的表达式是否存在
-
$: end of the expression - $:表达结束
You should also check Wikipedia page for regexp if you'd like to learn more, it's rather well done.
如果你想了解更多，你也可以查看*的regexp页面，它做得很好。
#2
12
Try this
试试这个
^[\d.]+$
^- start of line
^——线的开始
[]- array of selections
[]——的选择
\d- any digit
\ d -任何数字
. - dot character
。-点字符
+ - 1 or many
+ - 1或多个
$ - end of line
$ -线的末端
#1
35
This code would do :
这段代码可以做到:
var str = "1.2"
var regexp = /^[0-9]+([,.][0-9]+)?$/g;
var result = regexp.test(str);
alert(result);
Where:
地点:
- str is the string you want to test
- str是要测试的字符串
- regexp is what you're testing the string with (built like:
/pattern/modifiers) - regexp是您正在测试的字符串(如:/模式/修饰符)
- result is a boolean, true if it matches, false otherwise
- 结果为布尔值，如果匹配为真，则为假
You should check this link about the RegExp object in JavaScript: http://www.w3schools.com/jsref/jsref_obj_regexp.asp
您应该在JavaScript中检查关于RegExp对象的链接:http://www.w3schools.com/jsref/jsref_obj_regexp.asp
About the regexp itself :
关于regexp本身:
-
^: start of the string - ^:字符串的开始
-
[0-9]+: at least one digit - [0-9]+:至少一位
-
[,.]: dot or comma - (,。点或逗号
-
[0-9]+: same as above - [0-9]+:和上面一样
-
(xxxxx)?: the expression inside the parenthesis can be present or not - (xxxxx)?:括号内的表达式是否存在
-
$: end of the expression - $:表达结束
You should also check Wikipedia page for regexp if you'd like to learn more, it's rather well done.
如果你想了解更多，你也可以查看*的regexp页面，它做得很好。
#2
12
Try this
试试这个
^[\d.]+$
^- start of line
^——线的开始
[]- array of selections
[]——的选择
\d- any digit
\ d -任何数字
. - dot character
。-点字符
+ - 1 or many
+ - 1或多个
$ - end of line
$ -线的末端