Function parse

Lib/re/_parser.py:963–988

(str, flags=0, state=None)

    return flags

def parse(str, flags=0, state=None):
    # parse 're' pattern into list of (opcode, argument) tuples

    source = Tokenizer(str)

    if state is None:
        state = State()
    state.flags = flags
    state.str = str

    p = _parse_sub(source, state, flags & SRE_FLAG_VERBOSE, 0)
    p.state.flags = fix_flags(str, p.state.flags)

    if source.next is not None:
        assert source.next == ")"
        raise source.error("unbalanced parenthesis")

    for g in p.state.grouprefpos:
        if g >= p.state.groups:
            msg = "invalid group reference %d" % g
            raise error(msg, str, p.state.grouprefpos[g])

    if flags & SRE_FLAG_DEBUG:
        p.dump()

    return p

def parse_template(source, pattern):
    # parse 're' replacement string into list of literals and