Python regex matching in conditionals

I am parsing file and I want to check each line against a few complicated regexs. Something like this

if re.match(regex1, line): do stuff
elif re.match(regex2, line): do other stuff
elif re.match(regex3, line): do still more stuff
...

Of course, to do the stuff, I need the match objects. I can only think of three possibilities, each of which leaves something to be desired.

if re.match(regex1, line): 
    m = re.match(regex1, line)
    do stuff
elif re.match(regex2, line):
    m = re.match(regex2, line)
    do other stuff
...

which requires doing the complicated matching twice (these are long files and long regex :/)

m = re.match(regex1, line)
if m: do stuff
else:
    m = re.match(regex2, line)
    if m: do other stuff
    else:
       ...

which gets terrible as I indent further and further.

while True:
    m = re.match(regex1, line)
    if m:
        do stuff
        break
    m = re.match(regex2, line)
    if m:
        do other stuff
        break
    ...

which just looks weird.

What's the right way to do this?