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]$
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Topically relevant: Regex for optional first special charactermickmackusa– mickmackusa ♦2025-04-23 04:15:41 +00:00Commented Apr 23 at 4:15
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3 Answers
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+$
2 Comments
Alix Axel
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+$.
Asaph
@Alix Axel: I was unaware of that rule. Thank you for pointing it out. Since phone numbers generally need to be more than 3 characters anyway, what do you think about
^\+?\d{4,}$ which is simpler and covers all the bases?Try this:
/^[\+]?([0-9]*)\s*\(?\s*([0-9]{3})?\s*\)?[\s\-\.]*([0-9]{3})[\s\-\.]*([0-9]{4})[a-zA-Z\s\,\.]*[x\#]*[a-zA-Z\.\s]*([\d]*)/
will match:
+1 ( 111)111-1111, #111
111-111-1111
(111)111-1111 x 1
111.111.1111x1
etc.
1 Comment
mickmackusa
This unexplained pattern is a messy to be honest. Plusses, dots, commas, and hashes don't need to be escaped inside of a character class. You don't need to use
a-zA-Z if you simply add an i pattern modifier. [0-9] and [\d] are simply written as \d. There are questionable usages of quantifiers and needless capture groups in multiple locations. I wouldn't recommend this script to anyone -- even if it did work (well enough) for their application.use this
/^(\+\d)*\s*(\(\d{3}\)\s*)*\d{3}(-{0,1}|\s{0,1})\d{2}(-{0,1}|\s{0,1})\d{2}$/;
2 Comments
Quentin
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)mickmackusa
{0,1} is simply written as ?. (-{0,1}|\s{0,1}) is more simply written as [-\s]?. Why does this pattern end with a semicolon? Why is the phone number allowed to start with unlimited repetitions of a plus sign followed by a number? Where is the plain English explanation? I wouldn't recommend this answer to anyone -- even if it did work (well enough) for their application.