java 匹配字符

直接上代码

 

package test;

 

import java.util.regex.Matcher;

import java.util.regex.Pattern;

 

public class PatternTest {

 

public static void main(String[] args) {

 

System.out.println("#########start#########");

String str = "121256789";

// regular expression

String regEx = "(12)";

//

Pattern p = Pattern.compile(regEx);

Matcher m = p.matcher(str);

boolean result = m.find();

System.out.println("the result is :" + result);

// change data

if (result) {

str = str.replaceAll(regEx, "00");

// str.replace for char and string, str.replaceAll for regular expression

System.out.println("the str is :" + str);

}

}