if m:= re.match(pattern_1, s):
    do_stuff_1()
elif m:= re.match(pattern_2, s):
    do_stuff_2()
elif m:= re.match(pattern_3, s):
    do_stuff_3()
else:
    print("No valid matches!")



m = re.match(pattern_1, s)
if m:
    do_stuff_1()
else:
    m = re.match(pattern_2, s)
    if m:
        do_stuff_2()
    else:
        m = re.match(pattern_3)
        if m:
            do_stuff_3()
        else:
            print("No valid matches!")