本文实例讲述了Java基于正则表达式实现查找匹配的文本功能。分享给大家供大家参考,具体如下:
REMatch.java:
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package reMatch;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Created by Frank
*/
public class REMatch {
public static void main(String[] args) {
String patt = "Q[^u]\\d+\\." ;
Pattern r = Pattern.compile(patt);
String line = "Order QT300. Now! QT400." ;
Matcher m = r.matcher(line);
while (m.find()) {
// group(0)或group()将会返回整个匹配的字符串(完全匹配);group(i)则会返回与分组i匹配的字符
// 这个例子只有一个分组
System.out.println(patt + " matches \"" + m.group( 0 ) + "\" in \"" + line + "\"" );
System.out.println( "start:" + m.start() + " end:" + m.end());
/*
输出:
Q[^u]\d+\. matches "QT300." in "Order QT300. Now! QT400."
start:6 end:12
Q[^u]\d+\. matches "QT400." in "Order QT300. Now! QT400."
start:18 end:24
*/
}
}
}
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eclipse运行结果如下图:
REMatchTwoFields.java:
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package reMatchTwoFields;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Created by Frank
*/
public class REMatchTwoFields {
public static void main(String[] args) {
String inputLine = "Adams,John Quincy" ;
Pattern r = Pattern.compile( "(.*),(.*)" );
Matcher m = r.matcher(inputLine);
if (!m.matches()) {
throw new IllegalArgumentException( "Bad Input" );
}
// 分组0得到的是整个原字符串
for ( int i = 0 ; i < m.groupCount() + 1 ; i++) {
System.out.println( "分组" + i + ":" + m.group(i));
/*
输出:
分组0:Adams,John Quincy
分组1:Adams
分组2:John Quincy
*/
}
}
}
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eclipse运行结果如下图:
希望本文所述对大家java程序设计有所帮助。