Java中正则表达式运用实例(参看java中正则表达式运用详解):
测试代码
package test;
/**
* 在String的matches()方法,split()方法中使用正则表达式.
* @author fhd001
*/
public class RegexTest {
public static void main(String[] args) {
/*
* 普通字符
*/
String str1 = "abc45abc345";
String[]arr1 = str1.split("abc");
for (String string : arr1) {
System.out.print(string+"-->");
}
System.out.println();
/*
* 简单的转义字符
* 在java中转义字符时一定要用双反斜线,两个斜线转义成一个斜线,
* 在用这个斜线字符转义那些特殊字符.
*/
String str2 = "^$()[]{}.?+*|";
boolean flag = str2.matches("//^//$//(//)//[//]//{//}//.//?//+//*//|");
System.out.println(flag);
/*
* 转义字符 /Q.../E.
*/
String str3 = "^$()[]{}.?+*|99999";
boolean flag2 = str3.matches("//Q^$()[]{}.?+*|//E//d{5}");
System.out.println(flag2);
/*
* 字符集合
*/
String str4 = "dfddri334";
boolean flag4 = str4.matches(".+");
System.out.println(flag4);
String str5 = "#$%^*())%";
boolean flag5 = str5.matches("//W{9}");
System.out.println(flag5);
String str6 = "4gffmdkekrhhr";
boolean flag6 = str6.matches("//w+");
System.out.println(flag6);
String str7 = "fjfdke eett ";
boolean flag7 = str7.matches("//w+//s+//w{4}//s?");
System.out.println(flag7);
String str8 = " erefff ";
boolean flag8 = str8.matches("//s+//S+//s+");
System.out.println(flag8);
String str9 = "456776888";
boolean flag9 = str9.matches("//d+");
System.out.println(flag9);
String str10 = "rtydfgrgwvr ";
boolean flag10 = str10.matches("//D+");
System.out.println(flag10);
/*
* 自定义字符集合 [ ]
*/
String str11 = "fdfeetg 34566";
boolean flag11 = str11.matches("[fdetg]+//s+[3-6]+");
System.out.println(flag11);
String str12 = "rtyuie 5768";
boolean flag12 = str12.matches("[^abcdf]+//s+[^1234]+");
System.out.println(flag12);
/*
* 匹配次数限定符
*/
//贪婪模式
String str13 = "ytreggcv454444444333";
boolean flag13 = str13.matches("//w{20}");
System.out.println(flag13);
boolean flag14 = str13.matches("//w{10,21}");
System.out.println(flag14);
boolean flag15 = str13.matches("//w{18,}");
System.out.println(flag15);
String str14 = "4";
boolean flag16 = str14.matches("//d?");
System.out.println(flag16);
String str15 = "ddcvgt";
boolean flag17 = str15.matches("//D+//d?");
System.out.println(flag17);
String str16 = "e33tf44t44t";
boolean flag18 = str16.matches("//w+//W*");
System.out.println(flag18);
//勉强模式(只举一例)
String str17 = "34567ghjkkld";
boolean flag19 = str17.matches("//d{2,7}?//w{8,11}");
System.out.println(flag19);
//占有模式(只举一例)
String str18 = "22222ddddd";
boolean flag20 = str18.matches("//d{2,5}+//w{6}");
System.out.println(flag20);
/*
* 字符边界
*/
String str19 = "a444545rot44tm";
boolean flag21 = str19.matches("^a//w+m$");
System.out.println(flag21);
/*
* 选择表达式 xxx | xxx
*/
String str20 = "abc123abc";
boolean flag22 = str20.matches("(abc|123){3}");
System.out.println(flag22);
/*
* 分组 ( ).
* 以上修饰符都是针对一个字符进行修饰.如果要对一组字符进行
* 修饰就要用到()
*/
String str21 = "123qwe123qwe";
boolean flag23 = str21.matches("(123qwe){2}");
System.out.println(flag23);
/*
* []中的交集与并集
*/
String str22 = "abcdefgh1234567";
boolean flag24 = str22.matches("[a-z1-9]+"); //并集
System.out.println(flag24);
boolean flag25 = str22.matches("[a-z1-9&&[a-h1-7]]+"); //交集
System.out.println(flag25);
}
}
结果代码
-->45-->345-->
true
true
true
true
true
true
true
true
true
true
true
true
true
true
true
true
true
true
false
true
true
true
true
true
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