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Posted to j-dev@xerces.apache.org by "Michael Glavassevich (JIRA)" <xe...@xml.apache.org> on 2006/06/20 21:59:33 UTC
[jira] Resolved: (XERCESJ-1126) Regular Expressions starting with
"." in non-XML Schema mode use wrong first character optimization
[ http://issues.apache.org/jira/browse/XERCESJ-1126?page=all ]
Michael Glavassevich resolved XERCESJ-1126:
-------------------------------------------
Resolution: Fixed
Thanks very much for this patch. I've applied it to SVN.
> Regular Expressions starting with "." in non-XML Schema mode use wrong first character optimization
> ---------------------------------------------------------------------------------------------------
>
> Key: XERCESJ-1126
> URL: http://issues.apache.org/jira/browse/XERCESJ-1126
> Project: Xerces2-J
> Type: Bug
> Versions: 2.7.1
> Reporter: Martin Probst
> Assignee: Michael Glavassevich
>
> The following Java snippet prints "not matched", but should print "matched".
> RegularExpression regex = new RegularExpression(".oo", "");
> if (regex.matches("foo")) System.out.println("matched");
> else System.out.println("not matched");
> It uses the class org.apache.xerces.impl.xpath.regex.RegularExpression.java. I believe this happens because of the first character optimization kicking in and checks for a first character of "o", does not match the 'f' and then consequently returns false. This may be caused by this code snippet from Token.java:493
> case DOT: // ****
> if (isSet(options, RegularExpression.SINGLE_LINE)) {
> return FC_CONTINUE; // **** We can not optimize.
> } else {
> return FC_CONTINUE;
> /*
> * result.addRange(0, RegularExpression.LINE_FEED-1);
> * result.addRange(RegularExpression.LINE_FEED+1,
> * RegularExpression.CARRIAGE_RETURN-1);
> * result.addRange(RegularExpression.CARRIAGE_RETURN+1,
> * RegularExpression.LINE_SEPARATOR-1);
> * result.addRange(RegularExpression.PARAGRAPH_SEPARATOR+1, UTF16_MAX);
> * return 1;
> */
> }
> I think it should unconditionally return FC_ANY for DOT, at least in the case of a starting '.'
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