Introduction

In this section, the task is to find whether the string contains URL and if the condition is true, the URL is returned.

Program

import re


def ck_url(x):
# Regular expression for url
    re_equ = r"(?i)\b((?:https?://|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'\".,<>?«»“”‘’]))"
    ck_url = re.findall(re_euq, x)
    if ck_url:
        return "The url in the string is : ",[i[0] for i in ck_url]
    else:
        return "No URL present!"
       
ip_str = input("Enter the string : ")
print(ck_url(ip_str))

Output 1:

Output 2:

Explanation

In the above python code, to check the URL in the string we have created a regular expression for URL and by using findall() in-built function we are checking the URL pattern in the input string. The findall() function scans the string from left to right and the value is returned.