Add validation for base64/ 58, sha256

[pickaxe828]

[w4rc0n]

You can just use regex for these.

base64: ^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$

base58: ^5[HJK][0-9A-Za-z&&[^0OIl]]{49}$

sha256sum: ^[A-Fa-f0-9]{64}$

In python:

import re

string = 'somestring'

if re.match('^[A-Fa-f0-9]{64}$', somestring):
    print('Match!')
else:
    print('No match!')

A validation library is great for things that can vary widely like domains, emails, etc. But hashes and b64/58 encoding has to follow a certain format, so regex is that way to go imo.

[Quix0r]

How about semantic version numbers?

[maaaaz]

#313