An example of the application of a Java regularization expression (illustrated by the matches method of string class) __ Regular expressions

Examples of the application of Java's regular expressions (see Java's application of the regular Expressions): Test code   package test;  /**    *  In string matches () method, the split () method uses regular expressions .    *  @author  fhd001    */    public class regextest {          public  Static void main (String[] args)  {               /*            *  Ordinary characters             */            String str1 =  "abc45abc345";            String[]arr1 = str1.split ("abc");           for   (STRING STRING : ARR1)  {                system.out.print (string+ "-->");           }            SYSTEM.OUT.PRINTLN ();                                   /*             *  Simple escape characters             *  You must use a double backslash when you are using Java to relay the literal characters. Two slash escape into a slash,            *  escape those special characters with this slash character .             */            String str2 =  ^$ () []{}.? +*|";            boolean flag = str2.matches ("//^//$ //(//)//[//]//{//}//.//?//+//*//|");            SYSTEM.OUT.PRINTLN (flag);                                   /*            *  Escape Character  /q.../e .            */            String str3 =  ^$ () []{}.? +*|99999 ";           boolean flag2 =  Str3.matches ("//q^$ () []{}.? +*|//E//D{5} ");           system.out.println (FLAG2);                                   /*             *  Character Set             */            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);                                   /*            *  custom character set  [ ]            */            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);                         &nbsP         /*             *  matching number qualifier             */                       //Greedy mode            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);                       //(just one example)             String str17 =  "34567ghjkkld";            boolean flag19 = str17.matches ("//d{2,7}"? w{8,11} ");           system.out.println (flag19);                        //occupancy mode (one case only)            String str18 =  " 22222DDDDD ";   &NBSp;       boolean flag20 = str18.matches ("//d{2,5}+//w{6}");            system.out.println (FLAG20);                       /*             *  character Boundaries              */           string str19  =  "A444545rot44tm";           boolean flag21  = str19.matches ("^a//w+m$");            System.out.println (flag21);                                  /*             *  Selection Expressions  xxx | xxx             */           STRING STR20  =  "ABC123ABC";           boolean flag22  = str20.matches ("(abc|123) {3}");            System.out.println (flag22);                                  /*             *  Group   ( ) .             *  above modifiers are decorated for one character. If you want to make a set of characters              *  decoration to be used ()              */   &Nbsp;       string str21 =  "123qwe123qwe";            boolean flag23 = str21.matches ("(123qwe) {2}");            SYSTEM.OUT.PRINTLN (flag23);                                  /*             * [] in the intersection and the set             */            String str22 =  "abcdefgh1234567";            boolean flag24 = str22.matches ("[a-z1-9]+");         //Collection             System.out.println (fLAG24);                       boolean flag25 = str22.matches ("[a-z1-9&&[a-h1-7]]+");  //intersection            system.out.println (flag25);        }  }  

  Result code  -->45-->345-->   true   true   true   True    true   true   true   true   true   true   true   true   true   true   true   true     true   false   true   true   true   true   True