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    <p>First off, your format validator is obviously only appropriate for <a href="http://en.wikipedia.org/wiki/North_American_Numbering_Plan" rel="noreferrer">NANP</a> (country code +1) numbers. Will your application be used by someone with a phone number from outside North America? If so, you don't want to prevent those people from entering a perfectly valid [international] number.</p> <p>Secondly, your validation is incorrect. NANP numbers take the form <code>NXX NXX XXXX</code> where <code>N</code> is a digit 2-9 and <code>X</code> is a digit 0-9. Additionally, area codes and exchanges may not take the form <code>N11</code> (end with two ones) to avoid confusion with special services <em>except</em> numbers in a non-geographic area code (800, 888, 877, 866, 855, 900) may have a <code>N11</code> exchange.</p> <p>So, your regex will pass the number (123) 123 4566 even though that is not a valid phone number. You can fix that by replacing <code>\d{3}</code> with <code>[2-9]{1}\d{2}</code>.</p> <p>Finally, I get the feeling you're validating user input in a web browser. Remember that client-side validation is <a href="https://stackoverflow.com/questions/1726617/form-validation-with-javascript-vs-php">only a <strong>convenience</strong> you provide to the user</a>; you still need to validate all input (again) on the server.</p> <p><strong>TL;DR</strong> don't use a regular expression to <a href="https://stackoverflow.com/a/5059082/1269037">validate complex real-world data like phone numbers</a> or <a href="https://stackoverflow.com/questions/37684/how-to-replace-plain-urls-with-links/21925491#21925491">URLs</a>. Use a <a href="https://github.com/googlei18n/libphonenumber" rel="noreferrer">specialized library</a>.</p>
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    1. COgreat comment, you has explained to me about things that I ignore, thanks a lot
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