java中正则表达式实例详解

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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