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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