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  1. import java.util.regex.Matcher;
  2. import java.util.regex.Pattern;
  3.  
  4. public class Main
  5. {
  6.    static void printMatch(String regex, String str, int... groups)
  7.    {
  8.       System.out.println("String = " + str);
  9.       System.out.println("Regex = " + regex);
  10.       Pattern p = Pattern.compile(regex);
  11.       Matcher m = p.matcher(str);
  12.       while (m.find())
  13.          for (int i: groups)
  14.             System.out.println("Group " + i + " = " + m.group(i));
  15.       System.out.println();
  16.    }
  17.  
  18.    public static void main(String[] args) throws Exception
  19.    {
  20.       System.out.println("The old way:");
  21.       String regex = "echo[\\t ]+\".*?(?<!\\\\)\"";
  22.       String str = "echo \"\\\\\"";
  23.       printMatch(regex, str, 0);
  24.  
  25.       System.out.println("The new way:");
  26.       regex = "echo[\\t ]+\"(\\\\.|[^\\\\])*?\"";
  27.       str = "echo \"\\\\\"";
  28.       printMatch(regex, str, 0);
  29.       str = "some other stuff echo \"This will not \\\" work\" some other stuff";
  30.       printMatch(regex, str, 0);
  31.    }
  32. }
Success #stdin #stdout 0.07s 380224KB
comments ()
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Standard input is empty
stdout
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The old way:
String = echo "\\"
Regex = echo[\t ]+".*?(?<!\\)"

The new way:
String = echo "\\"
Regex = echo[\t ]+"(\\.|[^\\])*?"
Group 0 = echo "\\"

String = some other stuff echo "This will not \" work" some other stuff
Regex = echo[\t ]+"(\\.|[^\\])*?"
Group 0 = echo "This will not \" work"
https://ideone.com/FFQDgb
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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