Re: java.util.regex.Pattern method matches() fails in this context

phillip.s.powell@[EMAIL PROTECTED]
 wrote:
> <%
> 
>    String stuff = "<c:im****t url=\"/common/lib\" context=\"common\" /
>> ";
>    if (Pattern.matches("context=\"", stuff)) {
>       out.println("the line has a match");
>    } else {
>       out.println("the line does not have a match");
>    }
> 
> %>
> 
> The following bit of JSP appears to constantly fail no matter how many
> times I run it.  I am simply looking for the pattern context=" and
> replacing it with context="/  throughout an entire String value, but
> my regular expression appears to be wrong.
> 
> Could someone help me figure out what the right expression would be?
> 
> Phil

 From the docs;

  "A matcher is created from a pattern by invoking the pattern's matcher 
method. Once created, a matcher can be used to perform three different 
kinds of match operations:

     *

       The matches method attempts to match the entire input sequence 
against the pattern.
     *

       The lookingAt method attempts to match the input sequence, 
starting at the beginning, against the pattern.
     *

       The find method scans the input sequence looking for the next 
subsequence that matches the pattern."

So your matches will always fail.  You can either modify your regex to 
match the entire sequence or use the find() method which searches.

im****t java.util.regex.*;

public class test {
     public static void main(String[] args) {
         String stuff =
          "<c:im****t url=\"/common/lib\" context=\"common\" /> >";

         Pattern p = Pattern.compile("context=\"");
         Matcher m = p.matcher(stuff);

         if (m.find()) {
             System.out.println("found");
             System.out.println("start="+m.start());
             System.out.println("end="+m.end());
         }
     }
}

C:\Do***ents and Settings\Knute Johnson>java test
found
start=28
end=37

-- 

Knute Johnson
email s/nospam/linux/

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