Java regular expression example

Example 1: match ${*}

package test;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegExpr {
   public static void main(String args[]) {
       Pattern pat = Pattern.compile("\\Q${\\E[^}]*}");// ${.*}
       String input = "123 ${abc} 456 ${xyz} abc ";
       Matcher matcher = pat.matcher(input);

       while (matcher.find()) {
           int start = matcher.start();
           int end = matcher.end();
           System.out.println("start=" + start + ", end=" + end
             + ",   match string=" + input.substring(start, end));
       }
   }
}

Output:
start=4, end=10,   match string=${abc}
start=15, end=21,   match string=${xyz}

Example 2: match [*]

package test;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegExpr2 {
   public static void main(String args[]) {

     Pattern pat = Pattern.compile("\\Q[\\E[^]]*]");// [xxx]
     String input = "123 [abc] 456 [xyz] abc ";
     Matcher matcher = pat.matcher(input);

     while (matcher.find()) {
 int start = matcher.start();
 int end = matcher.end();
 System.out.println("start=" + start + ", end=" + end
    + ", match=" + input.substring(start+1, end-1));
 }
     }
}

Output:
start=4, end=9,   match string=abc
start=14, end=19,   match string=xyz