Regexp issue with lot of spaces in the end of config

[Shagrat]

Hello!

Noticed strange delays, or even and seemingly endless loop while parsing a bunch of config files. Was able to determine that

python-nginx/nginx.py

Lines 540 to 554 in 20a8484

	double = r'\s*"[^"]*"'
	single = r'\s*\'[^\']*\''
	normal = r'\s*[^;\s]*'
	s1 = r'{}|{}|{}'.format(double, single, normal)
	s = r'^\s*({})\s*((?:{})+);'.format(s1, s1)
	m = re.compile(s).search(data[index:])
	if m:
	logging.debug("Key {0} {1}".format(m.group(1), m.group(2)))
	k = Key(m.group(1), m.group(2))
	if lopen and isinstance(lopen[0], (Container, Server)):
	lopen[0].add(k)
	else:
	f.add(k) if conf else f.append(k)
	index += m.end()
	continue

in "loads" function (lines 540-554)
takes an exponentially long time if the end of config file has lot's of spaces (starting from 18 it can take up to 5 seconds end each next space increases time more)

Sadly I'm not a regexp ninja so I can't fix it by myself and just started to clean end of a file with strip, but maybe this knowledge will help someone somehow.

python-nginx==1.5.6
Python 3.6.12 (default, Dec 1 2020, 13:45:56)
[GCC 10.2.0] on linux

Example config file attached
example.conf.txt