substring-before - XPath 编辑
XSLT/XPath Reference: XSLT elements, EXSLT functions, XPath functions, XPath axes
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
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.
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