substring-before
The substring-before
function returns a string that is the part of a given string before a given substring.
Syntax
substring-before( haystack, needle )
Arguments
haystack
-
The string to be evaluated. Part of this string will be returned.
needle
-
The substring to search for. Everything before the first occurrence of
needle
inhaystack
will be returned.
Returns
A string.
Examples
XPath Example | Output |
---|---|
substring-before('aa-bb','-') |
aa |
substring-before('aa-bb','a') |
(empty string) |
substring-before('aa-bb','b') |
aa- |
substring-before('aa-bb','q') |
(empty string) |
Defined
Gecko support
Supported.