FunctX XQuery 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

XQuery Function Declaration

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

   tokenize($arg,$regex)[1]
 } ;

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