FunctX XSLT Function Library > Strings > Substrings >

functx:substring-before-match

The substring before the last text that matches a regex

Description

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

Arguments and Return Type

XSLT Function Declaration

<xsl:function name="functx:substring-before-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="
   tokenize($arg,$regex)[1]
 "/>

</xsl:function>

Examples

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

abc-

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

a

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

abcd-abcd

See Also

History