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    Validating phone numbers is crucial to ensure data consistency and integrity in applications. Regular expressions (regex) provide a powerful tool for pattern matching and validation. Here, we'll explore how to use regex to validate phone numbers, including those with country codes.

    Regex Pattern for Phone Number Validation

    To validate phone numbers, we need a regex pattern that checks for the following:

    • The number should start with a plus sign (+).

    • It should be followed by the country code and national number.

    • It may contain white spaces or hyphens (-).

    • The length of the phone number may vary from 7 to 15 digits.

    Here is a regex pattern that meets these criteria:

    ^\+[1-9]{1}[0-9]{0,2}[-\s]?[2-9]{1}[0-9]{2}[-\s]?[2-9]{1}[0-9]{2}[-\s]?[0-9]{4}$

    Explanation:

    • ^: Asserts the start of the string.

    • \+: Matches the plus sign.

    • [1-9]{1}[0-9]{0,2}: Matches the country code (1 to 3 digits, not starting with 0).

    • [-\s]?: Matches an optional hyphen or whitespace.

    • [2-9]{1}[0-9]{2}: Matches the area code (3 digits, not starting with 0 or 1).

    • [-\s]?: Matches an optional hyphen or whitespace.

    • [2-9]{1}[0-9]{2}: Matches the telephone prefix (3 digits, not starting with 0 or 1).

    • [-\s]?: Matches an optional hyphen or whitespace.

    • [0-9]{4}: Matches the line number (4 digits).

    • $: Asserts the end of the string.

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    Includes AI-generated content
    Does a regex match a phone number?
    Here is a regex that will match any phone number for every country in the world regardless of the number of digits. It matches formatted and unformatted national and international phone numbers. If you want to adjust it to match a certain number of digits, you can do that easily. Example of phone numbers that it will match:
    stackoverflow.com
    Stack Overflow
    https://stackoverflow.com/questions/123559
    How to validate phone numbers using regex - Stack Overflow
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