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Date: Tue, 05 Apr 2011 05:28:59 -0700
From: Patricia Shanahan <pats@acm.org>
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Subject: 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