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  1. import java.util.Scanner;
  2. import java.util.regex.Matcher;
  3. import java.util.regex.Pattern;
  4.  
  5. class Replace {
  6.     public static void main(String[] args) {
  7.         String s= ":20:9405601140\n:2D::11298666\n:28C:20/1";
  8.  
  9.         Scanner scanner = new Scanner(s);
  10.         Pattern pattern = Pattern.compile("(:(\\w+)[:\\|]+)(.*)");
  11.  
  12.         while (scanner.hasNextLine()) {
  13.             String input = scanner.nextLine();
  14.             Matcher matcher = pattern.matcher(input);
  15.             if (matcher.matches()) {
  16.                 if (matcher.group(1).startsWith(":20")) {
  17.                     System.out.println(matcher.group(1) + "1234");
  18.                 }
  19.                 // more if statements or other rules
  20.                 else {
  21.                     // no rule
  22.                     System.out.println(input);
  23.                 }
  24.             }
  25.             else {
  26.                 System.out.println(input);
  27.             }
  28.         }
  29.  
  30.     }
  31. }
  32.  
Success #stdin #stdout 0.09s 380736KB
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Standard input is empty
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:20:1234
:2D::11298666
:28C:20/1
https://ideone.com/9TkGx6
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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