fn.replace( $input as String?, $pattern as String, $replacement as String, [$flags as String] ) as String?
Returns a string constructed by replacing the specified $pattern on the $input string with the specified $replacement string.
|$input||The string to start with.|
|$pattern||The regular expression pattern to match. If the pattern does not match the $input string, the function will return the $input string unchanged.|
|$replacement||The regular expression pattern to replace the $pattern with. It can also be a capture expression (for more details, see http://www.w3.org/TR/xpath-functions/#func-replace).|
|$flags||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.|
fn.replace("this is a string", "this", "that"); => that is a string