regex any non-digit with exception

Question

I've got strings like these:

+996999966966AA
-996999966966AA

I am using this code:

"+996999966966AA".gsub!(/\D/, "")

to get rid of any character except digits, but the sign + also being stripped. How can my code retain the +?

Answer 1

You can also use \W, "non-word character" which matches any character that is not a word character (alphanumeric & underscore)).

(\W\d+)\w+

Answer 2

Use:

[^+\d]

to match anything that isn't + or a digit.