FunctX XQuery 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

XQuery Function Declaration

declare namespace functx = "http://www.functx.com";
declare function functx:substring-before-last-match
  ( $arg as xs:string? ,
    $regex as xs:string )  as xs:string? {

   replace($arg,concat('^(.*)',$regex,'.*'),'$1')
 } ;

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