Re: [Exist-development] [Exist-open] matches() regex syntax

[Dmitriy S. <sha...@gm...>]

On Tue, 2010-10-05 at 23:05 +0200, Stefan Majewski wrote:
> Quite a while ago I wrote the message below. At that time I noticed
> that XQuery does not allow for look-aheads and look-behinds in
> regexes. Nonetheless, exist at that time used java regex syntax which
> allowed that. Obviously that has changed, as I get this error when
> migrating some patterns from 1.4 to current trunk.
> 
> a call to matches() with an offending regex yields the following
> message:
> Conversion from XPath2 to Java regular expression syntax failed: Error at character 2 in regular expression (\b)(test)(\b): invalid escape sequenc
> 
> This is just a stupid example, I know, but at some points
> lookahead/behind can be very handy. I am just wondering if there is
> any chance to get java regex behaviour back? I fear it is for some
> reason not possible, like standards conformance, indexes?. I guess I
> could find some kind of work-around.
> 
> Anybody else stumbling over things like this?

I did update it to saxon's new one (old was taken from saxon too). Can
you give me example, so I can try to fix, explain why not or recommend
workaround. 

-- 
Cheers,

Dmitriy Shabanov