Pattern for validating mobile numbers with extensions using regular expressions

I am struggling to combine multiple separate regex validations into one for my mobile number validation requirements. The criteria include validating mobile numbers with a country code or starting with 00, as well as checking if they contain an extension number (2-5 digits) separated by a #.

Here is an example of a valid number:

+919986040933
00919986040933
+919986040933#12
+919986040933#123
+919986040933#1234
+919986040933#12345

The current regex patterns I have for validation are:

var phoneRegexWithPlus = "^((\\+)|(00))[0-9]{10,14}$";
var phoneRegexWithZero = "^((\\+)|(00))[0-9]{9,12}$";
var phoneRegexExtension = "^[0-9]{2,5}$";

Currently, I am checking whether the number contains a # symbol, and if so, splitting it to match the number and extension parts separately where the extension comes after the hash.

My challenge now is to create a single regex that combines all three validations above. Can anyone help me with this as I am not proficient in regex? Thank you in advance.

javascriptangularjsregexng-pattern

Answer №1

Here is a suggested expression for you:

^\+?(?:00)?\d{12}(?:#\d{2,5})?$

If you want to see how this regex works in action, check out the regex demo

Explanation of the Expression:

  • ^ - signifies the start of the string
  • \+? - represents an optional plus sign (the ? allows for zero or one occurrence)
  • (?:00)? - indicates an optional occurrence of 00
  • \d{12} - specifies exactly 12 digits in a row
  • (?:#\d{2,5})? - denotes an optional sequence where:
    • # - denotes a literal hash symbol
    • \d{2,5} - matches between 2 to 5 digits (which could represent your specific phoneRegexExtension)
  • $ - marks the end of the string.

The essential parts covered by both phoneRegexWithPlus and phoneRegexWithZero are included in the initial segment \+?(?:00)?\d{12}, which matches 12 to 14 digits with an optional plus sign at the beginning.

NOTE: This regex has been tailored to fit the sample input provided. If the input varies, you may need to adjust the limiting quantifiers like {12} to a range such as {9,14} to accommodate 9 to 14 occurrences of the specified pattern.

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