Regular expression internal code.
make __internal._regex(rgx): Class constructor.rgx: Regular expression to create.destruct __internal._regex(): Destroys regular expression object.match(text): Matches regular expression to text.text: Text to match on.match(text, start): Matches regular expression to text.text: Text to match on.start: Position in string to start from (0-based).set_insensitive(val): Sets case insensitivity of regular expression.val: Value to set to (true/false).