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Re: simple regex pattern sought

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On 25.05.2012 23:55, Lew wrote:
> Roedy Green wrote:
>> I often have to search for things of the form
>>
>> "xxxxx"
>> or
>> 'xxxxx'
>>
>> where xxx is anything not " or '.  It might be Russian or English or
>> any other language.
>>
>> What is the cleanest way to do that?
>
> Use a regex like "[\"'][^\"']+[\"']" is one way. The cleanest? I don't know.

That does not match quoting properly.  Better do something like

"([\"'])[^\"']*\\1"

Still I prefer

"\"[^\"]*\"|'[^']*'"

Because it allows for quotes of the other type inside quotes.

With proper escaping (using \ as escape char, any other works, too) this 
becomes

"\"(?:\\\\.|[^\\\"])*\"|'(?:\\\\.|[^\\'])*'"

Kind regards

	robert


package rx;

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

public class Quotes {

   private static final Pattern Q1 = Pattern.compile("([\"'])[^\"']*\\1");
   private static final Pattern Q2 = Pattern.compile("\"[^\"]*\"|'[^']*'");
   private static final Pattern Q3 = 
Pattern.compile("\"(?:\\\\.|[^\\\"])*\"|'(?:\\\\.|[^\\'])*'");

   public static void main(String[] args) {
     System.out.println(Q1);
     for (final Matcher m = Q1.matcher("'a' \"b\" 'c'"); m.find();) {
       System.out.println(m.group());
     }

     System.out.println(Q2);
     for (final Matcher m = Q2.matcher("'a' \"b\" 'c'"); m.find();) {
       System.out.println(m.group());
     }

     System.out.println(Q3);
     for (final Matcher m = Q3.matcher("'a' \"\\\"b\" 'c'"); m.find();) {
       System.out.println(m.group());
     }
   }

}


-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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Thread

simple regex pattern sought Roedy Green <see_website@mindprod.com.invalid> - 2012-05-25 14:45 -0700
  Re: simple regex pattern sought markspace <-@.> - 2012-05-25 14:55 -0700
  Re: simple regex pattern sought Lew <lewbloch@gmail.com> - 2012-05-25 14:55 -0700
    Re: simple regex pattern sought markspace <-@.> - 2012-05-25 15:04 -0700
      Re: simple regex pattern sought Lew <noone@lewscanon.com> - 2012-05-26 14:07 -0700
        Re: simple regex pattern sought markspace <-@.> - 2012-05-26 18:34 -0700
          Re: simple regex pattern sought Lew <noone@lewscanon.com> - 2012-05-27 11:39 -0700
    Re: simple regex pattern sought Lew <lewbloch@gmail.com> - 2012-05-25 15:03 -0700
    Re: simple regex pattern sought Robert Klemme <shortcutter@googlemail.com> - 2012-05-26 00:12 +0200
      Re: simple regex pattern sought markspace <-@.> - 2012-05-25 18:43 -0700
        Re: simple regex pattern sought Robert Klemme <shortcutter@googlemail.com> - 2012-05-26 16:37 +0200
          Re: simple regex pattern sought markspace <-@.> - 2012-05-26 08:06 -0700
            Re: simple regex pattern sought Robert Klemme <shortcutter@googlemail.com> - 2012-05-26 17:34 +0200
              Re: simple regex pattern sought Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-05-26 10:07 -0700
      Re: simple regex pattern sought Roedy Green <see_website@mindprod.com.invalid> - 2012-05-26 06:19 -0700
        Re: simple regex pattern sought markspace <-@.> - 2012-05-26 07:19 -0700
        Re: simple regex pattern sought markspace <-@.> - 2012-05-26 07:57 -0700
          Re: simple regex pattern sought Robert Klemme <shortcutter@googlemail.com> - 2012-05-26 17:13 +0200
            Re: simple regex pattern sought markspace <-@.> - 2012-05-26 10:08 -0700
              Re: simple regex pattern sought Roedy Green <see_website@mindprod.com.invalid> - 2012-05-26 14:14 -0700

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