Pattern
SubPattern
Tokenizer
expand_template(template, match)
is_char(char)
is_firstchar(char)
isname(name)
isname_with_attrs(name)
parse(str, flags, pattern)
parse_template(source, pattern)
_class_escape(source, escape)
_escape(source, escape, state)
_group(escape, groups)
_parse(source, state)
_parse_sub(source, state, nested)