Regular Expressions Are Supported
Although XSLT 1.0 supports functions such as contains(), substring-before(), and substring-after(), these are no
substitute for regular expressions. The regular expression support in
XSLT 2.0 is very powerful and flexible. See the discussions of the
[2.0] <xsl:analyze-string> element and the [2.0] matches(), [2.0] replace(),
and [2.0] tokenize() functions for the details on
regular expression support. Appendix E has a
complete overview of the regular expression syntax used in XSLT 2.0
and XPath 2.0.
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