FunctX XSLT Function Library > Strings > Substrings >

functx:substring-before-last-match

The substring after the first text that matches a regex

Description

The functx:substring-before-last-match function returns the part of $arg that appears before the last match of $regex. If $arg does not match $regex, the entire $arg is returned. If $arg is the empty sequence, the empty sequence is returned.

Arguments and Return Type

XSLT Function Declaration

<xsl:function name="functx:substring-before-last-match" as="xs:string?"
              xmlns:functx="http://www.functx.com">
  <xsl:param name="arg" as="xs:string?"/>
  <xsl:param name="regex" as="xs:string"/>

  <xsl:sequence select="
   replace($arg,concat('^(.*)',$regex,'.*'),'$1')
 "/>

</xsl:function>

Examples

functx:substring-before-last-match(
  'abc-def-ghi', '[ce]')

abc-d

functx:substring-before-last-match(
  'abcd-abcd', 'ab?')

abcd-

functx:substring-before-last-match(
  'abcd-abcd', 'x')

abcd-abcd

See Also

History