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Groups > comp.lang.java.programmer > #2888

Re: regex capability

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On 4/5/2011 6:33 AM, Robert Klemme wrote:

>>> On Apr 5, 2:35 am, markspace<-@.>    wrote:
>>>> Why re-invent the wheel?

>
> In this case I just wanted to demonstrate the strategy to first check
> overall validity of the input and extract the interesting part and
> then ripping that interesting part apart.  Whether a Scanner or
> another Matcher is used for the second step wasn't that important to
> me.  Also, the thread is called "regex capability". :-)

Fair enough. :)


>
> But, of course, your approach using the Scanner is perfectly
> compatible with the two step strategy as Patricia also pointed
> out. :-)


Don't forget too that Scanner can do other things besides use 
delimiters.  It has methods like skip() and findInLine() that ignore 
delimiters and could be used to build a simple parser.  You can also 
change the delimiters on the fly to extract different sections of text.

A simple change to my example above:

public class ScannerTest {
     public static void main(String[] args) {
         StringReader in = new StringReader(
                 "Support DDR2 100/200/300/400 DDR2 SDRAM");

         Scanner scanner = new Scanner(in);
         scanner.findInLine( "Support DDR2" );
         scanner.useDelimiter( "[ /]+" );
         while( scanner.hasNextInt() ) {
             System.out.println( scanner.nextInt() );
         }
     }
}

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regex capability Roedy Green <see_website@mindprod.com.invalid> - 2011-04-04 00:19 -0700
  Re: regex capability Leif Roar Moldskred <leifm@dimnakorr.com> - 2011-04-04 02:34 -0500
    Re: regex capability Roedy Green <see_website@mindprod.com.invalid> - 2011-04-04 00:50 -0700
      Re: regex capability Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-04-04 08:03 -0400
        Re: regex capability Patricia Shanahan <pats@acm.org> - 2011-04-04 05:25 -0700
        Re: regex capability David Lamb <dalamb@cs.queensu.ca> - 2011-04-04 18:51 -0400
      Re: regex capability Jim Gibson <jimsgibson@gmail.com> - 2011-04-04 17:07 -0700
  Re: regex capability bugbear <bugbear@trim_papermule.co.uk_trim> - 2011-04-04 09:26 +0100
    Re: regex capability Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-04-04 19:20 +0200
    Re: regex capability Robert Klemme <shortcutter@googlemail.com> - 2011-04-04 22:13 +0200
      Re: regex capability markspace <-@.> - 2011-04-04 18:35 -0700
        Re: regex capability bugbear <bugbear@trim_papermule.co.uk_trim> - 2011-04-05 09:09 +0100
        Re: regex capability Paul Cager <paul.cager@googlemail.com> - 2011-04-05 02:10 -0700
          Re: regex capability Patricia Shanahan <pats@acm.org> - 2011-04-05 05:28 -0700
            Re: regex capability Robert Klemme <shortcutter@googlemail.com> - 2011-04-05 06:33 -0700
              Re: regex capability markspace <-@.> - 2011-04-05 10:07 -0700

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