FunctX XQuery Function Library > Strings > Substrings >

functx:substring-before-if-contains

Performs substring-before, returning the entire string if it does not contain the delimiter

Description

The functx:substring-before-if-contains function performs substring-before, returning the entire string if it does not contain the delimiter. It differs from the built-in fn:substring-before function, which returns a zero-length string if the delimiter is not found.

Arguments and Return Type

XQuery Function Declaration

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

   if (contains($arg,$delim))
   then substring-before($arg,$delim)
   else $arg
 } ;

Examples

functx:substring-before-if-contains('abcd','c')

ab

functx:substring-before-if-contains('abcd','x')

abcd

See Also

History