substring before function in XSLT 2.0 - substring

Question

I need help with string manipulation.
Scenario:
<ADR_LINE>This is a sample text, to test adr-line.</ADR_LINE>
Requirement is to split ADR_LINE into 2 if length is more than 20. While splitting we need to make sure that the last character in the string should be space, comma, or full stop.
In this example, total length is 40 and split is something like:
<ADR_LINE>This is a sample tex</ADR_LINE>
<ADR_LINE>t, to test adr-line.</ADR_LINE>
To avoid cutting word 'text' in this example, I am trying to use below logic:
<xsl:if test="not(substring($adrlnpart1, 20) = ' ' or '.' or ',' or '-')">
<xsl:variable name="adrln2trunc" select="substring-before($adrln2part1,' ')"/>
</xsl:if>
in the substring-before function, I am not sure if we can specify multiple characters (space, comma, or full stop) to look at the end of string. In this example checking for space may work, but other scenarios will require comma or full stop.
Please suggest your ideas to handle this. Thanks in advance.

Answer 1

Here is an example using xsl:analyze-string:
<?xml version="1.0" encoding="UTF-8" ?>
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
<xsl:output indent="yes"/>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="ADR_LINE[string-length() > 20]">
<xsl:analyze-string select="." regex=".{{19,}}?([., ]|$)">
<xsl:matching-substring>
<ADR_LINE>
<xsl:value-of select="."/>
</ADR_LINE>
</xsl:matching-substring>
<xsl:non-matching-substring>
<ADR_LINE>
<xsl:value-of select="."/>
</ADR_LINE>
</xsl:non-matching-substring>
</xsl:analyze-string>
</xsl:template>
</xsl:transform>
Splits
<ADR_LINE>This is a sample text, to test adr-line.</ADR_LINE>
into
<ADR_LINE>This is a sample text,</ADR_LINE>
<ADR_LINE> to test adr-line.</ADR_LINE>
Online sample at http://xsltransform.net/pNmBy2a.