substring-before

substring-before

The substring-before() function returns that part of a string value that occurs before the first occurrence of some specified substring.

For example, the value of «substring-before('print=yes') » returns the string "print" .

Argument	Data Type	Meaning
value	xs:string?	The containing string
substring	xs:string?	The test string
collation (optional)	xs:string	The collation to be used for comparing strings
Result	xs:string	A string containing those characters that precede the first occurrence of the test substring within the containing string