fn:contains

Returns true if the second string is a substring of the first.

contains($arg1 as xs:string?, $arg2 as xs:string?) ➔ xs:boolean

contains($arg1 as xs:string?, $arg2 as xs:string?, $collation as xs:string) ➔ xs:boolean

Arguments
	$arg1	xs:string?	The containing string
	$arg2	xs:string?	The contained string
	$collation	xs:string	The collation to be used for comparing the strings
Result		xs:boolean

http://www.w3.org/2005/xpath-functions