How to use re match objects in a list comprehension

Question

I have a function to pick out lumps from a list of strings and return them as another list:

def filterPick(lines,regex):
    result = []
    for l in lines:
         


        

Answer 1

It could be shortened a little

def filterPick(lines, regex):
    matches = map(re.compile(regex).match, lines)
    return [m.group(1) for m in matches if m]

You could put it all in one line, but that would mean you would have to match every line twice which would be a bit less efficient.