fn.matchesfn.matchesfnmatches/apidoc/8.0/fn:matches.xml
Returns true if the specified $input matches the specified
$pattern, otherwise returns false.
The input from which to match.
inputString?
The regular expression to match.
patternString
The flag representing how to interpret the regular expression. One of
"s", "m", "i", or "x", as defined in
http://www.w3.org/TR/xpath-functions/#flags.
flagsStringBoolean?
fn.matches("this is a string", "is");
=> true
fn.matches("this is a string", "zoo");
=> false