Regex to Validate Phone Numbers in php

Question

I know there are lots of same type of questions posted on stackoverflow but I have something in custom and dont know how to solve this problem.

If any number is prefixed with ‘+’ or 0 (sequence of zero like 00) or ‘91-‘, then it should be removed automatically before group creation. prefixed needs to be removed -

0 or sequence of 0 (00, 000, 0000 etc)
+
91-
+91-

Valid mobile numbers entered by users should be as below:

If mobile number is 10 digit, it should start with 9,8,7 or 6
If mobile number is 12 digit, first 2 digits should be 91 and 3rd digit should be 9,8,7 or 6 All other numbers should be considered invalid for domestic group creation.

What will be the php code for above as will be?

phone no ex-

+918877665544 or 0918877665544 or 0000918877665544 will give 918877665544 (length 12)
+91-8877665544 or 91-8877665544 or 00008877665544 will give 8877665544 (length 10)
+91-88776655440 (length 11) or 91-88-77665544 (- in between) will give gets skip or should giv blank

only digits are allowed after removing the allowed prefixes.

if any other it should skip (should give blank).

Note:- for all the cases it should have only one regex as this regex will be inserted from config settings.

You are asking for multiple things here. One, you want to format the input numbers a certain way, and two, you want to validate them using a regex. Please show us sample valid input phone numbers which cover all edge cases. — Tim Biegeleisen, Sep 25 '19 at 05:59
@TimBiegeleisen I have edited my question with some example please have a look. — Vikas Chauhan, Sep 25 '19 at 06:15
I would just go with something like `(?:[+]?0*(?:91-?)?)?([6-9][0-9]{9})` and look at the first capture group — NullUserException, Sep 25 '19 at 06:30
Of course you need to add the ^ and $ anchors to ensure it matches the whole string — NullUserException, Sep 25 '19 at 06:36

The fourth bird · Accepted Answer · 2019-09-25T09:08:14.880

1

One option could be using optional parts at the start of the pattern:

^\+?0*(?:91-)?\K(?:91)?[6-9][0-9]{9}$

^ Start of string
\+?0*(?:91-)? Optionally match +, 0+ times a 0 or 91-
\K Forget what was matched
(?:91)? Optionally match 91
[6-9][0-9]{9} Match a digit 6-9 and 9 digits 0-9
$ End of string

Regex demo | Php demo

If you don't want to use anchors ^ and $ you could use lookaround assertions to make sure what is directly on the left and right is not a non whitespace char:

(?<!\S)\+?0*(?:91-)?\K(?:91)?[6-9][0-9]{9}(?!\S)

Regex demo | Php demo

edited Sep 25 '19 at 09:08

answered Sep 25 '19 at 07:52

The fourth bird

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I have huge set of numbers in array format. Do I need to change them to string format break by line or there is any other solution to this? – Vikas Chauhan Sep 25 '19 at 08:23
@VikasChauhan I have added an update to the answer. – The fourth bird Sep 25 '19 at 08:31
Could you please update the php demo code ? – Vikas Chauhan Sep 25 '19 at 09:01
@VikasChauhan have added another php demo for the second regex. – The fourth bird Sep 25 '19 at 09:08
Wouldn't this match `91-918877665544`? – NullUserException Sep 26 '19 at 04:01
@NullUserException Yes it is giving it as a valid number but it should be an invalid one – Vikas Chauhan Sep 26 '19 at 05:00
In the question it states `+91-8877665544 or 91-8877665544 or 00008877665544 will give 8877665544`. Is that not correct? – The fourth bird Sep 26 '19 at 06:42
This matches `91-918877665544`, which should be an invalid number – NullUserException Sep 26 '19 at 18:04

Regex to Validate Phone Numbers in php

1 Answers1