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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.regex.*;
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		String str = "HELLO_WORLD_123456 TEst";
  13.  
  14. 	    System.out.println ("First test");
  15. 	    String regex1 = ".*(WORLD).*";
  16. 	    String matchedString = getValueByregexExpr (str, regex1);
  17. 	    //Here, I want to obtain matchedString = WORLD
  18. 	    if (matchedString == null) {
  19. 	        System.out.println ("matchedString null");
  20. 	    } else if (matchedString.equals (regex1)) {
  21. 	        System.out.println ("String found but empty group(1)");
  22. 	    } else {
  23. 	        System.out.println ("Result : " + matchedString);
  24. 	    }
  25.  
  26. 	    //Here, I want to obtain matchedString = WORLD_123456
  27. 	    System.out.println ("\nSecond test");
  28. 	    String regex2 = "(WORLD_[^_\\s]+)";
  29. 	    matchedString = getValueByregexExpr (str, regex2);
  30. 	    if (matchedString == null) {
  31. 	        System.out.println ("regex " + regex2 + " matchedString null");
  32. 	    } else if (matchedString == regex2) {
  33. 	        System.out.println ("regex " + regex2 + " String found but empty group(1)");
  34. 	    } else {
  35. 	        System.out.println ("regex " + regex2 + " Result : " + matchedString);
  36. 	    }
  37.  
  38. 	}
  39. 	public static String getValueByregexExpr (String str, String regexExpr) 
  40. 	{
  41.     	Pattern regex = Pattern.compile (regexExpr, Pattern.DOTALL);
  42.     	Matcher matcher1 = regex.matcher (str);
  43.     	if (matcher1.find ()) {
  44. 	        if (matcher1.groupCount () != 0 && matcher1.group (1) != null) {
  45.     	        for (int i = 0; i <= matcher1.groupCount (); i++) {
  46.         	        System.out.println ("matcher " + i + " for regex " + regexExpr + "= " + matcher1.group (i));
  47.             	}
  48.             	return matcher1.group (1);
  49. 	        }
  50.         	return regexExpr;
  51. 	    }
  52. 	    return null;
  53. 	}
  54. }
Success #stdin #stdout 0.09s 320576KB
comments (?)
stdin 
Standard input is empty
stdout 
First test
matcher 0 for regex .*(WORLD).*= HELLO_WORLD_123456 TEst
matcher 1 for regex .*(WORLD).*= WORLD
Result : WORLD

Second test
matcher 0 for regex (WORLD_[^_\s]+)= WORLD_123456
matcher 1 for regex (WORLD_[^_\s]+)= WORLD_123456
regex (WORLD_[^_\s]+) Result : WORLD_123456
https://ideone.com/j3E2Fr
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
secret

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