# Credit Mike Dunderdale for regex

import time

time_start = time.time()

#ip_str = "255.000.0.111"

ip_str = "23.34.45.45"

import re

def ipFormatChk(ip_str):

pattern = re.compile(r"""

\b # matches the beginning of the string

(25[0-5]| # matches the integer range 250-255 OR

2[0-4][0-9]| # matches the integer range 200-249 OR

[01]?[0-9][0-9]?) # matches any other combination of 1-3 digits below 200

\. # matches '.'

(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?) # repeat

\. # matches '.'

(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?) # repeat

\. # matches '.'

(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?) # repeat

\b # matches the end of the string

""", re.VERBOSE)

if re.match(pattern, ip_str):

return True

else:

return False

for i in range(10000):

i = ipFormatChk(ip_str)

print i

time_end = time.time()

print time_end-time_start