XSLT using regex pattern - regex

Question

I have a requirements to get the value based on a priority #schemeNames. Get the value of ID if the #schemeName='TaxNumber' is present, else if #schemeName='PassportNumber', else if #schemeName is no value. After getting the value, it needs to check or ignore the 1st 2 characters if it is Alpha. Also, I need to consider the spaces between words in #schemeName. If for example, the value of my #schemeName is 'Tax Number' or 'taxnumber' it is valid. But if the value is like this, 't axNum Ber', it should not validate this value.
Here is my XSLT:
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="/">
<Result>
<xsl:for-each select="/Record/Data/ID">
<xsl:choose>
<xsl:when test="matches(lower-case(.[#schemeName]),'^tax\s+number')">
<xsl:if test="matches(substring(.,1,2),'^[a-zA-Z]+$')">
<xsl:value-of select="substring(.,3)"/>
</xsl:if>
</xsl:when>
<xsl:when test="matches(lower-case(.[#schemeName]),'^passport\s+number')">
<xsl:if test="matches(substring(.,1,2),'^[a-zA-Z]+$')">
<xsl:value-of select="substring(.,3)"/>
</xsl:if>
</xsl:when>
<xsl:when test=".[#schemeName='']">
<xsl:if test="matches(substring(.,1,2),'^[a-zA-Z]+$')">
<xsl:value-of select="substring(.,3)"/>
</xsl:if>
</xsl:when>
</xsl:choose>
</xsl:for-each>
</Result>
</xsl:template>
</xsl:stylesheet>
INPUT:
<Record>
<Data>
<ID schemeName="TaxNumber">PT123457</ID>
<ID schemeName="PassportNumber">PT098732</ID>
<ID schemeName="LicenseNumber">PT445423</ID>
<ID schemeName="">PT7566435</ID>
</Data>
</Record>
GENERATED OUTPUT:
<Result>7566435</Result>
The output generated is coming from the #schemeName that is null. It should be coming from the TaxNumber since it is present. There's something wrong in my condition when checking the #schemeNames.
I am using XSLT v2.0. Thank you!

Answer 1

How about setting your priorities in variables? Something like:
<xsl:variable name="prio1" select="ID[matches(lower-case(#schemeName),'^tax\s?number')]"/>
<xsl:variable name="prio1_value">
<xsl:choose>
<xsl:when test="matches($prio1, '^[A-z]{2}.*$')">
<xsl:value-of select="substring($prio1,3)"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$prio1"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="prio2" select="ID[matches(lower-case(#schemeName),'^passport\s?number')]"/>
<xsl:variable name="prio2_value">
<xsl:choose>
<xsl:when test="matches($prio2, '^[A-z]{2}.*$')">
<xsl:value-of select="substring($prio2,3)"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$prio2"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="prio3" select="ID[#schemeName='']"/>
<xsl:variable name="prio3_value">
<xsl:choose>
<xsl:when test="matches($prio3, '^[A-z]{2}.*$')">
<xsl:value-of select="substring($prio3,3)"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$prio3"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
Note: I have changed \s+ to \s? to make the space optional.
Also, you can use the if-then-else construct in xslt 2.0. The final code is below:
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="/">
<xsl:apply-templates select="Record/Data"/>
</xsl:template>
<xsl:template match="Data">
<xsl:variable name="prio1" select="ID[matches(lower-case(#schemeName),'^tax\s?number')]"/>
<xsl:variable name="prio1_value">
<xsl:choose>
<xsl:when test="matches($prio1, '^[A-z]{2}.*$')">
<xsl:value-of select="substring($prio1,3)"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$prio1"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="prio2" select="ID[matches(lower-case(#schemeName),'^passport\s?number')]"/>
<xsl:variable name="prio2_value">
<xsl:choose>
<xsl:when test="matches($prio2, '^[A-z]{2}.*$')">
<xsl:value-of select="substring($prio2,3)"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$prio2"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="prio3" select="ID[#schemeName='']"/>
<xsl:variable name="prio3_value">
<xsl:choose>
<xsl:when test="matches($prio3, '^[A-z]{2}.*$')">
<xsl:value-of select="substring($prio3,3)"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$prio3"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<Result>
<xsl:value-of select="if ($prio1) then ($prio1_value) else
if ($prio2) then ($prio2_value) else
if ($prio3) then ($prio3_value) else 0"/>
</Result>
</xsl:template>
</xsl:stylesheet>