java中正则表达式运用实例(用String类的matches方法演示)

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