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Groups > comp.lang.java.programmer > #2884

Re: regex capability

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On 4/5/2011 2:10 AM, Paul Cager wrote:
> On Apr 5, 2:35 am, markspace<-@.>  wrote:
>> On 4/4/2011 1:13 PM, Robert Klemme wrote:
>>
>>> if ( m.matches() ) {
>>> for (m = number.matcher(m.group(1)); m.find();) {
>>> int x = Integer.parse(m.group());
>>> }
>>
>> Why re-invent the wheel?
>>
>> 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.useDelimiter( "[^0-9]+" );
>>           while( scanner.hasNextInt() ) {
>>               System.out.println( scanner.nextInt() );
>>           }
>>       }
>>
>> }
>>
>> (Lightly tested.)
>
> $ java ScannerTest
> 2
> 100
> 200
> 300
> 400
> 2

This is a nice illustration of the case for a strategy I often use in
this sort of situation, combining tools using each to do the jobs it
does best.

For example, a regular expression match could pull out the
"100/200/300/400" substring, and a Scanner could extract the integers
from that. More generally, it could be split and then each of the split
results processed some other way.

Patricia

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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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