pythonregex

Need to write regex for top-level web address which includes letters, numbers, underscores as well as periods, dashes, and a plus sign

The check_web_address function checks if the text passed qualifies as a top-level web address, meaning that it contains alphanumeric characters (which includes letters, numbers, and underscores), as well as periods, dashes, and a plus sign, followed by a period and a character-only top-level domain such as ".com", ".info", ".edu", etc. Fill in the regular expression to do that, using escape characters, wildcards, repetition qualifiers, beginning and end-of-line characters, and character classes.

import re

def check_web_address(text):
  pattern = ___
  result = re.search(pattern, text)
  return result != None

print(check_web_address("gmail.com")) # True
print(check_web_address("www@google")) # False
print(check_web_address("www.Coursera.org")) # True
print(check_web_address("web-address.com/homepage")) # False
print(check_web_address("My_Favorite-Blog.US")) # True

I have tried with this pattern but all sample input came true:

pattern = '[^/@][A-Za-z._-]*$'

What will be exact pattern to cover all above scenario?

Solution

  • Finally I have got this way to cover all above scenarios with below code,

    import re
def check_web_address(text):
  pattern = r'^[A-Za-z._-][^/@]*$'
  result = re.search(pattern, text)
  return result != None

print(check_web_address("gmail.com")) # True
print(check_web_address("www@google")) # False
print(check_web_address("www.Coursera.org")) # True
print(check_web_address("web-address.com/homepage")) # False
print(check_web_address("My_Favorite-Blog.US")) # True