Fix buggy regex (make the prefix optional).

Author: ionelmc

src/manhole/cli.py

@@ -27,7 +27,7 @@
         SIG_NUMBERS.add(num)
 
 
-def parse_pid(value, regex=re.compile(r'^.+(/manhole-)?(?P<pid>\d+)$')):
+def parse_pid(value, regex=re.compile(r'^(.*/manhole-)?(?P<pid>\d+)$')):
     match = regex.match(value)
     if not match:
         raise argparse.ArgumentTypeError("PID must be in one of these forms: 1234 or /tmp/manhole-1234")