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From: markspace <-@.>
Newsgroups: comp.lang.java.programmer
Subject: Re: regex capability
Date: Tue, 05 Apr 2011 10:07:21 -0700
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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() );
         }
     }
}