Java中正则表达式的简单使用

这个项目中我用了JUnit来做的单元测试。

 

import java.util.regex.Matcher;import java.util.regex.Pattern;import org.junit.Test;public class TestRegularExp {@Testpublic void testSearch(){String str = "lingyibin";String regExp = "n*y";Pattern pattern = Pattern.compile(regExp);//,Pattern.CASE_INSENSITIVE);Matcher matcher = pattern.matcher(str);boolean b = matcher.find();System.out.println(b);System.out.println(matcher.start() + "--->" + matcher.end());}@Testpublic void testGetSubStr(){String str = "E://Eclipse3_6//workspace//Test.txt";//We'll have to use four '/' instead of oneString regExp = ".+////(.+)$";//"////.+////";Pattern pattern = Pattern.compile(regExp);Matcher matcher = pattern.matcher(str);matcher.find(); //This is could not be deleted! Or you'll get an error!int cnt = matcher.groupCount();for(int i = 0; i <= cnt; i ++){System.out.println(matcher.group(i));}}@Testpublic void testSplit(){String str = "ling#yi#bin";String regExp = "#";Pattern pattern = Pattern.compile(regExp);String[] strs = pattern.split(str);for(String s:strs){System.out.println(s);}}@Testpublic void testReplace(){String str = "lllling";String regExp = "l+";Pattern pattern = Pattern.compile(regExp);Matcher matcher = pattern.matcher(str);str = matcher.replaceAll("L");System.out.println(str);}}