Validate string using Regex

[Gribouillis]

A way to ignore the space is simply to allow white space together with the characters you mentioned. I would use

valid = re.match(r'^(?:[a-zA-Z0-9]|\s)*$', inp1) is not None

Tips:

1. Always use raw strings when you write regexes, ie r''
   
2. Python 2 support ends in 2020, use python 3.