Regex for strings utility

[rhys tucker]

I'm trying to write a script which operates like the Unix 'strings' utility but I'm having difficulties with the regex.

#!/usr/bin/env python

# strings program

import sys, re

f = open(sys.argv[1])
line = f.readline()
pattern = ([\040-\126\s]{4,})

while line:	
	# regular expression to match strings >=4 chars goes here
	matches = findall(pattern, line)
	for match in matches;
		print match
	line = f.readline()



I'm getting a Syntax Error: Invalid Token at the closing brace to the pattern.

thanks,

rhys