One Web crawler in Python3
Use Mode:
-h, --help show this help message and exit
-u URL, --url URL set the URL: https://google.com, http://test.com
-r REGEX, --regex REGEX set one personalized regex or use one predefined: link, phone, email
-a USERAGENT, --userAgent USERAGENT set the user-agent
-O OUTPUT, --output OUTPUT set the output file name <br