正则表达式的具体操作功能1：

package regular;

public class RegexDemo1 {

/**
* @正则表达式的具体操作功能：
* 特点：用一些特定的符号表示一些代码操作，这样就简化方法
*
* 1.匹配：String matches方法。用规则匹配整个字符串，只要有一处不符合规则就匹配结束，返回false;
*
* 2.切割：String split(String regex)
*
* 3.替换：String replaceAll()
*
*
*/
public static void main(String[] args) {

//demo();
//sop('a'+0);
//check_qq();
//phone();
//split_demo("zhangsan lisi wangwu "," +");//按多个空格切割
//split_demo("zhangsan.lisi.wangwu","\\.");//按.切割
//split_demo("c:\\abc\\a.txt","\\\\");
//split_demo("agsfkkdjaahbeqqazzzzzzzzzzzzrfs","(.)\\1+");//按照叠词完成切割

String str = "wef152346578954ty123456485fsaijger154354ffafd";//将数字替换成#号
//replaceAllDemo(str,"\\d{5,}","#");
String str1="agvsdkkddddddasfzzdazzzzzzzfewffrfas";
//replaceAllDemo(str1,"(.)\\1+","&");//将叠词替换成&agvsd&&asf&da&few&rfas
//replaceAllDemo(str1,"$1");//将叠词替换成单个字符agvsdkdasfzdazfewfrfas，用'$'返回组的内容
replaceAllDemo(str1,"$1");//

}

public static void replaceAllDemo(String str,String reg,String newStr){
str = str.replaceAll(reg,newStr);
sop(str);
}

private static void split_demo(String str,String reg) {

String[] arr = str.split(reg);

//高级for循环，遍历数组
for(String s : arr){
sop(s);
}

}

private static void check_qq() {
String qq = "123456";
String reg = "[1-9]\\d{4,11}";
boolean flag = qq.matches(reg);
if(flag)
sop("qq : " +qq);
else
sop("输入错误");
}
//13xxx,15xxx,18xxx
private static void phone() {
String tel = "123456";
String reg = "1[358]\\d{9}";
boolean flag = tel.matches(reg);
if(flag)
sop("tel : " +tel);
else
sop("输入错误");
}

private static void demo() {
String str = "b345";
String reg ="\\w\\d*\\w";
boolean b = str.matches(reg);
System.out.println(b);
}

public static void sop(Object obj){
System.out.println(obj);
}

}

原文地址：https://www.jb51.cc/regex/360501.html