tokenize with delimeter inside and outside of a string with xslt 2.0 - xslt-2.0

Question

I do have an input with randon values in parentheses,square brackets,Curly brackets and values outside brackets.Any type of bracket can occur in any randam position, where all are seperated by delimeter comma.
I have used <xsl:for-each select="tokenize(test,',')">
but as comma is present both inside and outside of brackets. It became impossible to achieve desired output. Please help me out
for example
INPUT
<test>{ST456,PT154},[GH456,JH768],(HJ789,KY456),GH789,PI345</test>
Desired OUTPUT
<test>{ST456,PT154}</test>
<test>[GH456,JH768]</test>
<test>(HJ789,KY456)</test>
<test>GH789</test>
<test>PI345</test>

Answer 1

You can use the xsl:analyze-string element in XSLT 2 or in XSLT 3 the same element or instead the analyze-string function, as in
<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"
expand-text="yes"
exclude-result-prefixes="xs fn"
version="3.0">
<xsl:param name="regex-pattern" as="xs:string" expand-text="no">\[([^\]]+)\]|\{([^\}]+)\}|\(([^)]+)\)|([^,]+)</xsl:param>
<xsl:output indent="yes"/>
<xsl:template match="test">
<xsl:apply-templates select="analyze-string(., $regex-pattern)//fn:group"/>
</xsl:template>
<xsl:template match="fn:group">
<test>{.}</test>
</xsl:template>
</xsl:stylesheet>
Online sample is at https://xsltfiddle.liberty-development.net/6qVRKw9, for XSLT 2 you would simply use an xsl:analyze-string element with the same pattern and then remove leading or trailing braces:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
expand-text="yes"
exclude-result-prefixes="xs"
version="2.0">
<xsl:param name="regex-pattern" as="xs:string" expand-text="no">\[([^\]]+)\]|\{([^\}]+)\}|\(([^)]+)\)|([^,]+)</xsl:param>
<xsl:output indent="yes"/>
<xsl:template match="test">
<xsl:analyze-string select="." regex="{$regex-pattern}">
<xsl:matching-substring>
<test>
<xsl:value-of select="replace(., '^[\[\{\(]|[\}\]\)]$', '')"/>
</test>
</xsl:matching-substring>
</xsl:analyze-string>
</xsl:template>
</xsl:stylesheet>
https://xsltfiddle.liberty-development.net/6qVRKw9/1