How to extract certain strings start with a symbol from a text file in python? -

how can extract words start symbol '$' text file?

file (ascii) -->

        @extendedattr = nvp_add(@extendedattr, "severity", $severity,    "description", $description, "eventid", $eventid,              "eventurl", $eventurl, "alertlevel", $alertlevel,        "eventstart", $eventstart,              "eventsourcecount", $eventsourcecount, "eventsourcetable",  $eventsourcetable, "eventdestcount", $eventdestcount) 

i want output (all in new line) :

$severity $description $eventid $eventurl $alertlevel $eventstart $eventsourcecount $eventsourcetable $eventdestcount 

use regex:

>>> import re >>> open('filename') f: ...     ans = [] ...     line in f: ...         matches = re.findall(r'(?<!\w)(\$\w+)', line) ...         ans.extend(matches) ...          >>> print ans ['$severity', '$description', '$eventid', '$eventurl', '$alertlevel', '$eventstart', '$eventsourcecount', '$eventsourcetable', '$eventdestcount'] 

now use str.join expected output:

>>> print "\n".join(ans) $severity $description $eventid $eventurl $alertlevel $eventstart $eventsourcecount $eventsourcetable $eventdestcount