The substring function returns a part of a given string.
Syntax
substring(string ,start [,length] )
Arguments
string- The string to evaluate.
start- The position within
stringthe substring begins
length(optional)- The length of the substring. If omitted, the returned string will contain every character from the
startposition to the end ofstring.
Returns
A string.
Notes
As in other XPath functions, the position is not zero-based. The first character in the string has a position of 1, not 0.
Defined
Gecko support
Supported.