On: In search of the perfect URL validation regex

[keeperofdakeys]

From experience, the python re module does weird things sometimes. There is a better third-party regex module, https://pypi.python.org/pypi/regex.

[pipeep → keeperofdakeys]

Does it use NFA?

http://swtch.com/~rsc/regexp/regexp1.html

Because the issue with the URL regex mentioned is with backtracking.