Regular expression that finds and replaces non-ascii characters with Python

Question

I need to change some characters that are not ASCII to \'_\'. For example,

Tannh‰user -> Tannh_user

• If I use regular expression with Python, how

Answer 1

With the magical regex [ -~] one can solve it:

import re
re.sub(r"[^ -~]", "_", "Tannh‰user")
# 'Tannh_user'

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Explanation:

• The ascii characters are the symbols ranging from " " to "~" - hence [ -~] captures all ascii chars
• By appending ^we can capture all non-ascii characters
• The rest is now a formality