I need to validate phone number in PHP. I have made following regex, but I also need to it to accept numbers starting with plus char, how can I do that?
^[0-9]$
A:
use this /^(+\d)\s((\d{3})\s*)*\d{3}(-{0,1}|\s{0,1})\d{2}(-{0,1}|\s{0,1})\d{2}$/;
Deepali
2010-05-19 05:23:55
That doesn't compile (at least in Perl, it might do in PHP), and if it did, then it seems odd to be so specific about the number of digits in a phone number that can start with a `+` (indicating an international phone number and this a very wide range of lengths and formatting conventions)
David Dorward
2010-05-19 05:54:45
+4
A:
The regex you provided in your question (^[0-9]$) will only match a one digit phone number.
At the very least you probably need to add the + modifier to allow one or more digits:
^[0-9]+$
To add an optional + at the beginning, you'll need to escape it since + is a special character in regular expressions:
^\+?[0-9]+$
And finally, \d is shorthand for [0-9] so you could shorten the expression to
^\+?\d+$
Asaph
2010-05-19 05:36:35
If there is a `+` (or a `00`) prefixing the number, the ICC has to have at least 1 up to 3 digits, so a more sensible regex would be `^(\+\d{1,3})?\d+$` or `^((\+|00)\d{1,3})?\d+$`.
Alix Axel
2010-05-19 05:53:01
@Alix Axel: I was unaware of that rule. Thank you for pointing it out. Since phone numbers generally need to be more than 3 characters anyway, what do you think about `^\+?\d{4,}$` which is simpler and covers all the bases?
Asaph
2010-05-19 06:00:42