java String matches 正则表达

　　

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);
    }
}

-->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