[jira] Commented: (XERCESC-1390) Regular expressions with unions do not work properly with replacing and tokenizing.

["Gareth Reakes (JIRA)" <xe...@xml.apache.org>]

     [ http://issues.apache.org/jira/browse/XERCESC-1390?page=comments#action_63035 ]
     
Gareth Reakes commented on XERCESC-1390:
----------------------------------------

I have added functionality to this code in the past, and the patch looks OK to me but I don't think I in that much of a better position than you as I have not touched this particular piece of it.

> Regular expressions with unions do not work properly with replacing and tokenizing.
> -----------------------------------------------------------------------------------
>
>          Key: XERCESC-1390
>          URL: http://issues.apache.org/jira/browse/XERCESC-1390
>      Project: Xerces-C++
>         Type: Bug
>   Components: Utilities
>     Versions: 2.6.0
>     Reporter: David Bertoni
>     Assignee: David Bertoni
>     Priority: Critical
>  Attachments: patch.txt
>
> Consider the following regular expression:
> "(ab) | (a)"
> with the following input string:
> "abracadabra"
> If you use an instance the RegularExpression class to replace any matching substrings with the empty string, the result should be the following string:
> "rcdr"
> Instead, just the last "a" in the string is replaced:
> "abracadabr"
> If you use the same RegularExpression instance to tokenize the expression, the result should be the following set of strings:
> ""
> "r"
> "c"
> "d"
> "r"
> ""
> Instead, the result is
> "abracadabr"
> ""
> I will attach a proposed patch, but I don't know this code well, so it would be great if someone could review it.

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