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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4. import java.util.regex.Matcher;
  5. import java.util.regex.Pattern;
  6.  
  7.  
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		String regex = "([0-9]+(?:\\.[0-9]+)?|[+]|[*]|[0-9]+)|\\S+";
  13.         String string = "45 + 31.05 * 110 @ 54";
  14.  
  15.         Pattern pattern = Pattern.compile(regex);
  16.         Matcher matcher = pattern.matcher(string);
  17.  
  18.         while (matcher.find()) {
  19.             if (matcher.group(1) == null) {
  20.             	// your Exception here
  21.             	//throw new Exception("No match!");
  22.                 System.out.println(matcher.group() + " no match");
  23.             } else {
  24.                 System.out.println(matcher.group(1) + "  match");
  25.             }
  26.         }
  27. 	}
  28. }
Success #stdin #stdout 0.12s 50520KB
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stdin
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Standard input is empty
stdout
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45  match
+  match
31.05  match
*  match
110  match
@ no match
54  match
https://ideone.com/hzWmuF
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
secret

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