Question

I have a string and I’m trying to remove all characters that are not alphanumeric nor in this set

'''!$%*()_-=+\/.,><:;'"?|'''.

I know this removes all non alphanumeric characters but how can I do better?

re.sub(r'\W+','',line)

Answer 1

A Python 2.x non-regex solution:

punctuation = '''!$%*()_-=+\/.,><:;'"?|'''
allowed = string.digits + string.letters + punctuation
filter(allowed.__contains__, s)

The string to filter is s. (This probably isn’t the fastest solution for long strings.)