import re

our_pattern = re.compile(r'.*(?:png|jpg|jpeg|gif|tiff|bmp|svg|js)$')
input_data = '''
www.gov.uk/
www.gov.uk/index.html
www.gov.uk/admin.html
www.gov.uk/somefile.jpeg
www.gov.uk/anotherone.png
'''

input_data = input_data.strip().split('\n')

for address in input_data:
    print('Address: %s\t Matched as Image: %s' % (address, bool(our_pattern.match(address))))
    #                                                           ^ or our_pattern.fullmatch