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Phone number regex Python

The regular expressions below can be used to validate if a string is a valid phone number format and to extract a phone number from a string. Please note that this validation can not tell if a phone number actually exists.

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Python
Java
C#
PHP

The basic international phone number validation

A simple regex to validate string against a valid international phone number format without delimiters and with an optional plus sign:

"^\\+?[1-9][0-9]{7,14}$"
Test it!
/^\+?[1-9][0-9]{7,14}$/

True

False

Enter a text in the input above to see the result

Example code in Python

# Validate phone number
import re

validate_phone_number_pattern = "^\\+?[1-9][0-9]{7,14}$"
re.match(validate_phone_number_pattern, "+12223334444") # Returns Match object

# Extract phone number from a string
extract_phone_number_pattern = "\\+?[1-9][0-9]{7,14}"
re.findall(extract_phone_number_pattern, 'You can reach me out at +12223334444 and +56667778888') # returns ['+12223334444', '+56667778888']

The more complex phone number validation

This regular expression will match phone numbers entered with delimiters (spaces, dots, brackets, etc.)

"^\\+?\\d{1,4}?[-.\\s]?\\(?\\d{1,3}?\\)?[-.\\s]?\\d{1,4}[-.\\s]?\\d{1,4}[-.\\s]?\\d{1,9}$"
Test it!
/^\+?\d{1,4}?[-.\s]?\(?\d{1,3}?\)?[-.\s]?\d{1,4}[-.\s]?\d{1,4}[-.\s]?\d{1,9}$/

True

False

Enter a text in the input above to see the result

Example code in Python

# Validate phone number
import re

validate_phone_number_pattern = "^\\+?\\d{1,4}?[-.\\s]?\\(?\\d{1,3}?\\)?[-.\\s]?\\d{1,4}[-.\\s]?\\d{1,4}[-.\\s]?\\d{1,9}$"
re.match(validate_phone_number_pattern, "+1 (615) 243-5172") # Returns Match object
Test it!

True

False

Enter a text in the input above to see the result

Extra information about validating phone number

While validation of phone numbers using regex can give a possibility to check the format of the phone number, it does not guarantee that the number exists.

There might be also an option to leave a phone number field without any validation since some users might have:

  • More complex phone numbers with extensions
  • The different phone numbers for calling them on a different time of day

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