Replacing particuar String using xsl - xslt

Question

I have a block as below.
<rightOperand>.*ifIndedx.*</rightOperand>
But i need to change the above snippet to the below one
<rightOperand>(?i)(?s).*ifIndex.*</rightOperand>
This translation needs to be done only when the right operand starts and ends with the string .*
please provide me some pointers .

Answer 1

You can do this my overriding the identity transform with an extra template just to match the text within rightOperand that matches your criteria
<xsl:template match="rightOperand/text()
[starts-with(., '.*')]
[substring(., string-length(.) - 1, 2) = '.*']">
Note that XSLT 1.0 does not have the ends-with function, which is why there is the extra work to check the ending with substring. If you were using XSLT 2.0 you could simplify this with ends_with though.
Here is the full XSLT
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:template match="rightOperand/text()
[starts-with(., '.*')]
[substring(., string-length(.) - 1, 2) = '.*']">
<xsl:text>(?i)(?s)</xsl:text><xsl:copy />
</xsl:template>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
When applied to your sample XML, the following is output:
<rightOperand>(?i)(?s).*ifIndedx.*</rightOperand>