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From "Nikolay Kuznetsov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-350) HARMONY-39 Regular expressions does not match backreferences during find.
Date Fri, 14 Apr 2006 17:29:00 GMT
HARMONY-39 Regular expressions does not match backreferences during find.
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         Key: HARMONY-350
         URL: http://issues.apache.org/jira/browse/HARMONY-350
     Project: Harmony
        Type: Bug

  Components: Classlib  
 Environment: All
    Reporter: Nikolay Kuznetsov
    Priority: Minor


For the optimization purposes match and find methods of HARMONY-39 regex works differently.
One of the differences that cause some problems is that group boundaries are being set in
different time (onward, in case of match and on the way back in the case of find). Thus back
references "\1-9" won't work as expected in case of find method (because in case of find boundaries
are not yet set when back reference appears). The same problem appears if pattern contains
".*", where we try to simulate find and face the same problem.

While fixing this problem the following simple issues was also found and fixed:

- Empty constructs are not being processed correctly. The examples of this construct are empty
group(i.e. "()"), or empty alternation(i.e. "|") and combinations with embedded flags, which
do not match actual characters. In all cases HARMONY-39 engine throws PatternSyntaxException
instead of returning token representing empty construct.

- Boundaries where embedded flags are in effect are not correctly processed:
      - Whitespaces being ignored after group which nested comment flag;
      - Global embedded flags do not mix with local once;
      - Minus sign in embedded flags automatically removes case insensitive flag;

The attached patch will address all mentioned above broblems.


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