valid domain return an invalid error

[chenrui]

Inputting a valid domain name "ktbooks.1.v77.faidns.com", I received a invalid domain error. A domain name can include only one digit between 2 dots. So the pattern could be changed like this:

pattern = re.compile(
r'^(:?(([a-zA-Z0-9]{1})|([a-zA-Z]{1}[a-zA-Z]{1})|' # domain pt.1
r'([a-zA-Z]{1}[0-9]{1})|([0-9]{1}[a-zA-Z]{1})|' # domain pt.2
r'([a-zA-Z0-9][-_a-zA-Z0-9]{0,61}[a-zA-Z0-9])).)+' # domain pt.3
r'([a-zA-Z]{2,13}|(xn--[a-zA-Z0-9]{2,30}))$' # TLD
)

[marmeladema]

I have the same problem. I use this module to parse domains from ads/malware delivery lists and indeed a of lot of them contain just a digit between two dots:

• us.2.cqcounter.com
• ms127.0.0.101341.club
• 1.adbrite.com

[marmeladema]

I created a PR #114 with @chenrui proposed fix.
Do you think it can be merged @kvesteri?