Remove everything except alphanumeric chars

Remove everything except alphanumeric characters from a string.

import re

S = '**//Python Exercises// - 12. '

pattern = re.compile('[\W_]+')

print(pattern.sub('', S))

Output:

PythonExercises12

See also

https://www.w3resource.com/python-exercises/re/python-re-exercise-41.php