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Topic

Jack Tan

Subject: Java exception when apply regular expression
Author: Jack Tan
Date: 28 Feb 2007 07:36 PM

I tested a small XQUERY program in the Stylus Studio 2006 Enterprise, build 653g.
In the scenarion using internal XQUERY processor all went smoothly. When switched to Saxon 8.7.1 it reports error:

error 719, FORX0002: Errot at character 1 in regular expressio "\x11|\\n" invalid escape sequence.

the offended line is:

...
fn:replace($var/name,"\x22|\\n"," ")
...

I simply want to replace "" and new lines in a string.

Why Saxon differs from the internal processor? What is wrong?

any pointers to relevant documentation suummarizing a correct course of action?

Thx

Jack

(Deleted User)

Subject: Java exception when apply regular expression
Author: (Deleted User)
Date: 05 Mar 2007 11:42 AM
Originally Posted: 05 Mar 2007 11:43 AM

Hi Jack,
the correct regex would be """|\n"

Hope this helps,
Alberto

Jack Tan

Subject: Java exception when apply regular expression
Author: Jack Tan
Date: 05 Mar 2007 02:41 PM

Thx,

Where can I find a document describing a difference between internal processor and Saxon? and when/why one should be used ?

Jack

(Deleted User)

Subject: Re: Java exception when apply regular expression
Author: (Deleted User)
Date: 06 Mar 2007 03:07 AM

Hi Jack,
the syntax of the regular expressions used in XQuery and XSLT is
described in the specs
(http://www.w3.org/TR/xpath-functions/#regex-syntax) that in turn is
based on the syntax described by the XMLSchema specs
(http://www.w3.org/TR/xmlschema-2/#regexs). There it's explained that
the only characters that need to be escaped are new lines, tab, and
the special characters \|.-^?*+{}()[].
This means that the regex you are specifying is: "|\n
As you need to insert this string inside an XQuery string literal,
you can choose to wrap it inside single quotes ('"|\n') or double
quotes, escaping the quote by duplicating it ("""|\n").
This is the official regex syntax, that both processor supports; the
internal processor also allows the usage of the syntax \xAA to
represent characters, but that is an implementation-specific extension.

Hope this helps,
Alberto

Jack Tan

Subject: Re: Java exception when apply regular expression
Author: Jack Tan
Date: 07 Mar 2007 01:37 PM

Alberto,

It seems that the safest way in defining scenario is to avoid the default internal processor ;-)

Thanks for help,

Jack

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