Subject: Re: [xsl] check the type of the $pattern argument to a regular expression? From: "bryan rasmussen" <rasmussen.bryan@xxxxxxxxx> Date: Mon, 16 Apr 2007 15:24:32 +0200 |
Cheers, Bryan Rasmussen
bryan rasmussen wrote: > Is there a concise description somewhere as to how they differ, are > there a large number of xslt regular expressions that are compatible > with Java regular expressions or are they basically incompatible? I > would suppose the main difference is that XSL-T regular expressions > are Unicode compatible regex's - correct? >
I don't suppose there is such an overview. Some flavors are explained in Jeffrey Friedl's famous book and some are (briefly) explained here: http://regular-expressions.info. But they don't explain W3's favorite flavor (which is to a large part one-way compatible with Perl's flavor). You could check and compare the following:
XSLT / XPath regexes: http://www.w3.org/TR/xmlschema-2/#regexs and http://www.w3.org/TR/xpath-functions/#regex-syntax Java regexes: http://java.sun.com/j2se/1.5.0/docs/api/java/util/regex/Pattern.html
The most obvious differences in syntax I found are the Java specific constructs, which are not covered in W3's flavor, like \p{javaLower} etc., possessive quantifiers, Quotation (\Q - \E), end/start of text (\A and \Z) and all special constructs (there is no look-ahead/look-behind, non-capturing parentheses, flags on/of in a group etc).
Cheers, -- Abel Braaksma
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