Nice way in without walrus

    m = re.match(p1, line)
    if m:
        return m.group(1)
    m = re.match(p2, line)
    if m:
        return m.group(2)
    m = re.match(p3, line)
    ...

With walrus:

    if m := re.match(p1, line):
        return m.group(1)
    elif m := re.match(p2, line):
        return m.group(2)
    elif m := re.match(p3, line):

The example would have been better if it didn't have the return, but just a value assign or a function call.