Writing Regex for phonenumber

Question

I want to write a regex to match phone numbers in following format i.e.

1- without country code 9999999999

2 - with 1 digit country code +19999999999

3 - with country code and () +1(999)9999999

4 - with country code () and - +1(999)-999-9999

I wrote a regex which matches condition 2 but failed in 1,3 and 4.

^[\+]?[(]?[0-9]{3}[)]?[-\s\.]?[0-9]{3}[-\s\.]?[0-9]{4,6}$

As soon as I adds country code after + sign along with () and - my regex stops working.

How Can I fix it? I am not a regex pro and assembled my regex by trying different patterns that I got by googling.

Any help would be appreciated.

Just FYI please !! This attached dupe is very generic duplicate, this current question is a specific one; and none of the answers given in dupe are meeting this. — RavinderSingh13, Apr 07 '21 at 17:18

RavinderSingh13 · Accepted Answer · 2021-04-01T17:45:42.113

7

EDIT: Since OP has added sample of phone numbers to be matched with + sign so adding following answer now.

^(?:\d{10})?(?:\+)?(?:(?:\d{11})?(?:\d\(\d{3}\))?(?:(?:\d{7})?(?:-\d{3}-\d{4})?))$

Here is Online demo for above regex

With your shown samples, could you please try following.

^\+(?:(?:\d{11})?(?:\d\(\d{3}\))?(?:(?:\d{7})?(?:-\d{3}-\d{4})?))$

Here is Online demo for above regex

Explanation: Adding detailed explanation for above.

^\+                        ##Checking if starting is from + sign.
(?:                        ##Starting a non-capturing group from here.
   (?:\d{11})?             ##Starting a non-capturing group which matches 11 digits here, keeping it optional.
   (?:\d\(\d{3}\))?        ##Starting a non-capturing group which matches single digit followed by ( 3 digits followed by ) and keeping this optional too.
   (?:                     ##Starting a non-capturing group here.
     (?:\d{7})?            ##Starting a non-capturing group here with 7 digits keeping it optional.
     (?:-\d{3}-\d{4})?     ##Starting a non-capturing group which has - 3 digits - 4 digits keep it optional.
   )                       ##Closing above non-capturing group here.
)$                         ##Closing very first non-capturing group here.

edited Apr 01 '21 at 17:45

answered Apr 01 '21 at 17:21

RavinderSingh13

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it works but It failed to match normal 10 digit number like 9999999999 – Sid Apr 01 '21 at 17:35
@SiddheshDilipKumar, ok you mean without starting `+`? Sorry but I believe that sample was not given in your question, please confirm if you want to match numbers without + here, thank you. – RavinderSingh13 Apr 01 '21 at 17:38
@SiddheshDilipKumar, ok sure, please try `^(?:\d{10})?(?:\+)?(?:(?:\d{11})?(?:\d$\d{3}$)?(?:(?:\d{7})?(?:-\d{3}-\d{4})?))$` once and let me know if this helps you? Once you confirm here, I will update the answer then. – RavinderSingh13 Apr 01 '21 at 17:42
I have one doubt though. what if country code is two digits then how can i edit (?:\d{11}). if I wrote (?:\d{1, })then it will accept two digit country code but looks bad. – Sid Apr 01 '21 at 18:08
@SiddheshDilipKumar, ok nice try :) could country code be more than 2 digits also?(sorry I am not sure on it) – RavinderSingh13 Apr 01 '21 at 18:10
@SiddheshDilipKumar, if country code is between 1 to 2 digits then try following, `^(?:\d{10})?(?:\+)?(?:(?:\d{11})?(?:\d{1,3}$\d{3}$)?(?:(?:\d{7})?(?:-\d{3}-\d{4})?))$` once. – RavinderSingh13 Apr 01 '21 at 18:14
I am not sure about that but in most common cases country codes can be 1 to 3 digits. Even in some cases it can be 1-868 ( Trinidad and Tobago ) – Sid Apr 01 '21 at 18:15
@SiddheshDilipKumar, oh ok sure, I have edited my previous comment's code, please do check it once and let me know how it goes. – RavinderSingh13 Apr 01 '21 at 18:17

JvdV · Answer 2 · 2021-04-01T18:08:45.297

Here is my two cents to your question. It looks like the following ticks the boxes too:

^(?:\+\d(?:\(\d{3}\)(?:-\d{3}-|\d{3})|\d{6})|\d{6})\d{4}$

See an online demo

^ - Start line anchor.
(?: - Open 1st non-capture group:
- \+\d - A literal "+" and a single digit.
- (?: - Open 2nd non-capture group:
  - $\d{3}$ - Match three digits between opening and closing paranthesis.
  - (?: - Open 3rd non-capture group:
    - -\d{3}- - Three digits between dashes.
    - | - Or:
    - \d{3}) - Just three digits before closing 3rd non-capture group.
  - | - Or:
  - \d{6}) - Just six digits before closing 2nd non-capture group.
- | - Or:
- \d{6}) - Or just six digits before closing 1st non-capture group.
\d{4} - Four digits.
$ - End line anchor.

Add an optional digit to the pattern to allow for 2-digit countrycodes too, e.g:

^(?:\+\d\d?(?:\(\d{3}\)(?:-\d{3}-|\d{3})|\d{6})|\d{6})\d{4}$

thanks @JvdV Your explanations helped me to understand little bit more about regex. — Sid, Apr 01 '21 at 18:21

Writing Regex for phonenumber

2 Answers2