XSLT + regular expression replace - regex

Question

I'm having a XML snippet like this:
...
<housenumber>23</housenumber>
...
<housenumber>453a</housenumber>
...
<housenumber>76-79</housenumber>
...
<housenumber>12 foo bar something 43</housenumber>
...
How can I cut these housenumbers into two parts with XSLT so that I get two variables - the first containing "everything from position 1 to the first occurence of a non-numeric character" and the second containing "everything else"?
So something like this:
...
<housenumber>23</housenumber>
<!-- v1 = 23, v2 = null -->
...
<housenumber>453a</housenumber>
<!-- v1 = 453, v2 = a -->
...
<housenumber>76-79</housenumber>
<!-- v1 = 76, v2 = -79 -->
...
<housenumber>12 foo bar something 43</housenumber>
<!-- v1 = 12, v2 = foo bar something 43 -->
...
Any hints/ideas?
Thanks.

Answer 1

As already pointed out in a comment, analyze-string can help, here is an example using XSLT 3.0 (as supported by Saxon 9.7 or Exselt) which makes use of the XPath 3.0 function analyze-string (https://www.w3.org/TR/xpath-functions-30/#func-analyze-string)
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:fn="http://www.w3.org/2005/xpath-functions"
xmlns:math="http://www.w3.org/2005/xpath-functions/math"
exclude-result-prefixes="xs math fn"
version="3.0">
<xsl:template match="root">
<xsl:variable name="matches" select="housenumber/analyze-string(., '(^[0-9]+)([^0-9]?.*)')//fn:match"/>
<xsl:variable name="v1" select="$matches//fn:group[#nr = 1]/xs:integer(.)"/>
<xsl:variable name="v2" select="$matches//fn:group[#nr = 2]/string()"/>
<integers>
<xsl:value-of select="$v1" separator=","/>
</integers>
<strings>
<xsl:value-of select="$v2" separator=","/>
</strings>
</xsl:template>
</xsl:stylesheet>
With the sample
<root>
<housenumber>23</housenumber>
...
<housenumber>453a</housenumber>
...
<housenumber>76-79</housenumber>
...
<housenumber>12 foo bar something 43</housenumber>
</root>
I get the output
<integers>23,453,76,12</integers><strings>,a,-79, foo bar something 43</strings>
With XSLT 2.0 you could use the xsl:analyze-string instruction:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xs"
version="2.0">
<xsl:template match="root">
<xsl:variable name="matches" as="element(match)*">
<xsl:apply-templates select="housenumber"/>
</xsl:variable>
<xsl:variable name="v1" select="$matches//group[#nr = 1]/xs:integer(.)"/>
<xsl:variable name="v2" select="$matches//group[#nr = 2]/string()"/>
<integers>
<xsl:value-of select="$v1" separator=","/>
</integers>
<strings>
<xsl:value-of select="$v2" separator=","/>
</strings>
</xsl:template>
<xsl:template match="housenumber">
<xsl:analyze-string select="." regex="(^[0-9]+)([^0-9]?.*)">
<xsl:matching-substring>
<match>
<group nr="1">
<xsl:value-of select="regex-group(1)"/>
</group>
<group nr="2">
<xsl:value-of select="regex-group(2)"/>
</group>
</match>
</xsl:matching-substring>
</xsl:analyze-string>
</xsl:template>
</xsl:stylesheet>