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RE: [xsl] check the type of the $pattern argument to a regular expression?
Subject: RE: [xsl] check the type of the $pattern argument to a regular expression? From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Mon, 16 Apr 2007 12:58:40 +0100 |
> This is one way to way check if a pattern is valid: > > <xsl:stylesheet version="2.0" > xmlns:regex="java.util.regex.Pattern" > xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > xmlns:saxon="http://saxon.sf.net/"> > > <xsl:template match="/"> > <xsl:value-of select="saxon:try(regex:compile(']['), > 'false')"/> </xsl:template> > > </xsl:stylesheet> > > This attempts to compile the regex using Java, and catches > the PatternSyntaxException using Saxon SA's saxon:try() > function. In this case it returns "false" because "][" is invalid. Java regular expressions and XPath regular expressions are not the same thing! Michael Kay http://www.saxonica.com/
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