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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