Regex for phone number in international format

Question

I need to write a regex that will match only this formats

+420 000 000 000
+420000000000
420 000 000 000
420000000000

It can't match any az character in any part of string, just numbers, white space and "+" on the beginning.

Answer 1

You could try the below regex,

^\+?\d{3} ?\d{3} ?\d{3} ?\d{3}$

DEMO

• ^ Asserts that we are at the start.
• \\+? optional +
• \\d{3} Matches exactly three digits.
• <space>? optional space
• $ Asserts that we are at the end.

Answer 2

This regex should work for you:

$mobileNumber = "0905 222 222";

 if ( preg_match("/^(\+?)([0-9] ?){9,20}$/", $mobileNumber) )
            echo "matches!";