See: <a href="/doc/reference/classes/ucalc.tokens/add/add-string,-tokentype,-string,-int,-regexgrammar,-int/">Add(string, TokenType, string, int, RegExGrammar, int)</a>, <a href="/doc/reference/classes/ucalc.tokens/contextswitch/contextswitch-tokens,-string,-string/">ContextSwitch(Tokens, string, string)</a>