java正则表达式介绍

java的正则表达式，功能还是挺强的。下面通过代码说明。

package com.test;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class TestString {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String str="PS{d86656E5-82c2-4257-8b52-95a15b18bdcd},TESTabc={6X},PPID={/yid=mouse at/ataddr=12.24.0.5},thisid=8138a35c-82c2-4257-8b52-95a15b18bdcd";
		String regex="(?<=\\{)(.*)(?=\\}";
		String gegexL[]= {
		 "(?<=\\{)(.*)(?=\\})",
		 "\\{(.*)\\}",
		 "\\{([^,]*)\\}",
		 "TEST([a-z|A-Z]*)=\\{([^,]*)\\}",
		 "TEST([a-z|A-Z]*)\\=\\{([^,]*)\\}",
		 "TEST([a-z|A-Z]*)\\=\\{([^,]*)\\,",
		 "TEST([a-z|A-Z]*)\\=\\{([a-z|A-Z|0-9]*)\\}\\,"
		 
		};
		for(int i=0;i<gegexL.length;i++){
			String rs=regexReplace(str,gegexL[i]);
			System.out.println("regexReaplace: "+rs);
		}
        String str1="我...我...要...要...吃...吃...饭";
        String regext ="\\.+";
        String newStr ="";
        str=regexNewString(str1,regext,newStr);
        regext ="(.)\\1+";
        newStr= "$1";
        regexNewString(str1,regext,newStr);
        str="foo[x+13,y-2,10]";
        regext = "foo\\{([^,]*),([^,]*),([^,]*)\\]";
        newStr = "foo($2,$1,$3)";
        regexNewString(str1,regext,newStr);
        String gegex2L[]={
        	"foo(10,7,2)",
        	"foo(x+10,y-7,2)",
        	"foo(bar(10),x+y+7,5)"
        };
        regext = "foo\\(([^,]*),([^,]*),([^,]*)\\)";
        for(int i=0;i<gegex2L.length; i++){
        	 regexNewString(gegex2L[i],regext,newStr);
        }
        str="TH{d86656E5-82c2-4257-8b52-95a15b18bdcd},YI={8138a35c-82c2-4257-8b52-95a15b18bdcd}";
        regext="TH\\{([^,]*)\\},YI=\\{([^,]*)\\}";
        newStr="TH{$1},Yhrt={$2}";
        regexNewString(str,regext,newStr);
        str="zhang 2000Windows xinping !";
        regext="(?<=95|98|NT|2000)Windows";
        match(str,regext);
        regext="(?!Windows)";
        regext="^(?:(?!(Windoes|def)).)*$";
        match(str,regext);
        str="zhang [email protected] test";
        regex="\\w+@(163|gmail|sina|qq)\\.\\w+";
        match(str,regext);
        System.out.println(" --------: ");
        str="ABhedeCD";
        regext="((?!hede).)*";
        match(str,regext);
        str="hi,hello,hzy,how nice  it is";
        regext="^(?!.*hello.*hzy)";
        match(str,regext);
        regexReplace(str,regext);
        str="abba,  anallagmatic";
        regext="^(.*(.)(.)$2$1)";
         regexReplace(str,regext);
        str="4632";
        regext="[0-9]*";
        match(str,regext);
	}
  
	public static boolean match(String str,String reg){
		boolean res=false;
		Matcher mat=Pattern.compile(reg).matcher(str);
		String fdsel="";
		if(mat.find()){
			fdsel=mat.group();
			res=true;
		}
		System.out.println(" matchString: "+fdsel);
		return res;
	}
	public static String regexReplace(String str,String reg){
		 
		Matcher mat=Pattern.compile(reg).matcher(str);
		String fdsel="";
		if(mat.find()){
			fdsel=mat.group();		 
		}	
		System.out.println(" SubString: "+fdsel);
		return str.replaceFirst(reg, "");
	}
	public static String regexNewString(String str,String reg,String newStr){
		String str2=str.replaceAll(reg, newStr);
		System.out.println(" regexNewString: "+str2);
		return str2;
	}
}

运行结果如下 ，除了普通的正则匹配, $n的支持还是挺强的。 

 SubString: d86656E5-82c2-4257-8b52-95a15b18bdcd},TESTabc={6X},PPID={/yid=mouse at/ataddr=12.24.0.5
regexReaplace: PS{},thisid=8138a35c-82c2-4257-8b52-95a15b18bdcd
 SubString: {d86656E5-82c2-4257-8b52-95a15b18bdcd},TESTabc={6X},PPID={/yid=mouse at/ataddr=12.24.0.5}
regexReaplace: PS,thisid=8138a35c-82c2-4257-8b52-95a15b18bdcd
 SubString: {d86656E5-82c2-4257-8b52-95a15b18bdcd}
regexReaplace: PS,TESTabc={6X},PPID={/yid=mouse at/ataddr=12.24.0.5},thisid=8138a35c-82c2-4257-8b52-95a15b18bdcd
 SubString: TESTabc={6X}
regexReaplace: PS{d86656E5-82c2-4257-8b52-95a15b18bdcd},,PPID={/yid=mouse at/ataddr=12.24.0.5},thisid=8138a35c-82c2-4257-8b52-95a15b18bdcd
 SubString: TESTabc={6X}
regexReaplace: PS{d86656E5-82c2-4257-8b52-95a15b18bdcd},,PPID={/yid=mouse at/ataddr=12.24.0.5},thisid=8138a35c-82c2-4257-8b52-95a15b18bdcd
 SubString: TESTabc={6X},
regexReaplace: PS{d86656E5-82c2-4257-8b52-95a15b18bdcd},PPID={/yid=mouse at/ataddr=12.24.0.5},thisid=8138a35c-82c2-4257-8b52-95a15b18bdcd
 SubString: TESTabc={6X},
regexReaplace: PS{d86656E5-82c2-4257-8b52-95a15b18bdcd},PPID={/yid=mouse at/ataddr=12.24.0.5},thisid=8138a35c-82c2-4257-8b52-95a15b18bdcd
 regexNewString: 我我要要吃吃饭
 regexNewString: 我.我.要.要.吃.吃.饭
 regexNewString: 我...我...要...要...吃...吃...饭
 regexNewString: foo(7,10,2)
 regexNewString: foo(y-7,x+10,2)
 regexNewString: foo(x+y+7,bar(10),5)
 regexNewString: TH{d86656E5-82c2-4257-8b52-95a15b18bdcd},Yhrt={8138a35c-82c2-4257-8b52-95a15b18bdcd}
 matchString: Windows
 matchString: zhang 2000Windows xinping !
 matchString: zhang [email protected] test
 --------: 
 matchString: AB
 matchString: 
 SubString: 
 SubString: 
 matchString: 4632