DO NOT REPLY [Bug 36405] New: - Referencing an optional backreference returns null

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http://issues.apache.org/bugzilla/show_bug.cgi?id=36405

           Summary: Referencing an optional backreference returns null
           Product: Regexp
           Version: unspecified
          Platform: Other
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Other
        AssignedTo: regexp-dev@jakarta.apache.org
        ReportedBy: peterox2pub-bz@yahoo.com


In version 1.4, searching for 

(^.*JAVA_OPTS=.*-Dprogram.name.*?)(\")?$

and replacing with 

$1 -Dap.home=c:/dir$2

Will return a string with 'null' on the end if the optional " character is not
matched.

So the line

set JAVA_OPTS=%JAVA_OPTS% -Dprogram.name=%PROGNAME%

will incorrectly become 

set JAVA_OPTS=%JAVA_OPTS% -Dprogram.name=%PROGNAME% -Dap.home=c:/dirnull

But 

set JAVA_OPTS="%JAVA_OPTS% -Dprogram.name=%PROGNAME%"

will correctly become

set JAVA_OPTS="%JAVA_OPTS% -Dprogram.name=%PROGNAME% -Dap.home=c:/dir"

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