The substring-before function returns a string that is the rest 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 occurance of
needleinhaystackwill 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.