Render HTML element only if a regex matches in XSLT - xslt

Question

I want to parse an XML Document and render a table based on a certain string. If there is a specific code I don't want that table to be rendered. Here is the simplified code I'm currently using without regex:
<xsl:template match="assortment">
<tr>
<td>
<table class="tgtable tgAssortment">
<xsl:call-template name="countryCodes">
<xsl:with-param name="parStr" select="./countryCodes"/>
<xsl:with-param name="parPos" select="1"/>
</xsl:call-template>
</table>
</td>
<td><div class="tgData"><xsl:value-of select="./totalPackRatio"/></div></td>
<td><div class="tgData"><xsl:value-of select="./name"/></div></td>
</tr>
<xsl:apply-templates select="./styles/style"/>
</xsl:template>
The element ./countryCodes is a string like this:
CB1-AT,CB1-CH,CB1-DE,CB2-FR,CB3-EE,CB3-LT,CB3-LV,CB3-SE,CB4-CZ
Or like this:
CB8-OSDE,CB8-OSBE,CB8-OSNL,CB8-OSCZ,CB8-OSGB,CB8-OSFR,CB8-OSPL,CB8-OSSK
In the second example all country codes start wit CB8 in that case I don't want to render the complete <tr>. I wanted to check it with a simple regex like this: (CB(?!8)\d) and tried to implement it wit xsl:analyze. Here is my code:
<xsl:template match="assortment">
<xsl:analyze-string select="./countryCodes" regex="CB(?!8)\d">
<xsl:matching-substring>
<tr>
<td>
<table class="tgtable tgAssortment">
<xsl:call-template name="countryCodes">
<xsl:with-param name="parStr" select="./countryCodes"/>
<xsl:with-param name="parPos" select="1"/>
</xsl:call-template>
</table>
</td>
<td><div class="tgData"><xsl:value-of select="./totalPackRatio"/></div></td>
<td><div class="tgData"><xsl:value-of select="./name"/></div></td>
</tr>
<xsl:apply-templates select="./styles/style"/>
</xsl:matching-substring>
</xsl:analyze-string>
</xsl:template>
This always gives me a stylesheet compilation error. I tried different regex and also using xsl:value-of as I thought it might be mandatory but this didn't work.
For debugging purposes I tried the following:
<xsl:template match="assortment">
<xsl:analyze-string select="./countryCodes" regex="CB(?!8)\d">
<xsl:matching-substring>
<div><xsl:value-of select="regex-group(1)"/></div>
</xsl:matching-substring>
</xsl:analyze-string>
<tr>
<td>
<table class="tgtable tgAssortment">
<xsl:call-template name="countryCodes">
<xsl:with-param name="parStr" select="./countryCodes"/>
<xsl:with-param name="parPos" select="1"/>
</xsl:call-template>
</table>
</td>
<td><div class="tgData"><xsl:value-of select="./totalPackRatio"/></div></td>
<td><div class="tgData"><xsl:value-of select="./name"/></div></td>
</tr>
<xsl:apply-templates select="./styles/style"/>
</xsl:template>
this was compiled successfully but obviously doesn't give the results I want. But I think it shows there is some problem with rendering the table inside the `xsl:analyze-string'. I'm stuck with this. Would appreciate any help. Thanks in advance!

Answer 1

If you only want to match on assortment elements where the countryCodes element has a comma delimited list of at least one code not starting with CB8 then using
<xsl:template match="assortment[not(every $token in tokenize(countryCodes, ',') satisfies starts-with($token, 'CB8'))]">
would do that.
As for a negative lookahead in regular expressions, that is not supported in the regular expression language XSLT and XPath 2.0 and later support, unless you use a processor dependent way to switch to the underlying platform's regular expression support e.g. for Saxon .NET use the flag ;n to swith to .NET's language, there you could have e.g.
<xsl:template match="assortment[every $token in tokenize(countryCodes, ',') satisfies matches($token, '^CB(?!8)\d', ';n')]">
I think but I am not quite sure which Saxon versions and editions support that.