Ruby regex for international phone numbers while excluding a specific country code

user_14080939 0
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I'm trying to create a regex to authorize international phone numbers in a form, while excluding phone numbers from France (i.e. starting with "+33", since I created a specific regex for this case).
This regex should catch phone numbers starting with '+' followed by the country code (1 to 4 digits) and 4 to 9 digits, with no space/dash/dot.

I've been looking around and came up with the following one, which includes all international phone numbers:

(\(?\+[1-9]{1,4}\)?([0-9]{4,11})?)

I want to exclude French numbers with...

[^+33]

but I can't find a way to combine it with my current regex.

Thanks in advance for your help.

ruby regex
2 Answers

Use a negative lookahead at the beginning

(?!^\+33)(\(?\+[1-9]{1,4}\)?([0-9]{4,11}) ?)

(?!^+33) True if not begin by +33

user_160779010

This regex should catch phone numbers starting with '+' followed by the country code (1 to 4 digits) and 4 to 9 digits, with no space/dash/dot.

Use

\A(?!\+33)\+\d{1,3}\d{4,9}\z

See regex proof.

EXPLANATION

--------------------------------------------------------------------------------
  \A                       the beginning of the string
--------------------------------------------------------------------------------
  (?!                      look ahead to see if there is not:
--------------------------------------------------------------------------------
    \+                       '+'
--------------------------------------------------------------------------------
    33                       '33'
--------------------------------------------------------------------------------
  )                        end of look-ahead
--------------------------------------------------------------------------------
  \+                       '+'
--------------------------------------------------------------------------------
  \d{1,3}                  digits (0-9) (between 1 and 3 times
                           (matching the most amount possible))
--------------------------------------------------------------------------------
  \d{4,9}                  digits (0-9) (between 4 and 9 times
                           (matching the most amount possible))
--------------------------------------------------------------------------------
  \z                       the end of the string
user_113298900
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