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* in*haystack* 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.