Regex allowing spaces (for a Phone number regex)

Question

I have this regex:

preg_match("#^([0-9]+)$#", $post['telephone'])

who allow only numbers (for a phone number in the French type so 0123456789) but I would like to allow spaces. For example allow this type of string: "01 23 45 67 89".

Can you please help me?

Answer 1

If you want to have exactly 8 digits, e.g., but still allow for arbitrary number of whitespace characters, the following is great:

^(?:\s*\d){8}$

Or, if you want to allow dashes too:

^(?:\s*-*\s*\d){8}$