Validating telephone numbers

Telephone numbers can be written as ten digits, or with dashes, spaces, or dots between the three segments, or with the area code parenthesized; both the area code and any white space between segments are optional.Thus, all of the following are valid telephone numbers: 1234567890, 123-456-7890, 123.456.7890, (123)456-7890, (123) 456-7890 (note the white space following the area code), and 456-7890.The validating phone number is an important point while validating an HTML form.In this page we have discussed how to validate a phone number (in different format) using Java Script : At first, we validate a phone number of 10 digits with no comma, no spaces, no punctuation and there will be no sign in front the number.

If you were calling someone in the same exchange as you were, you only had to dial the last four digits of the number.Long distance calling generally involved a human operator.Modern American telephone numbers have ten digits, segmented as a three-digit area code, a three-digit exchange code, and a four-digit number.This not only creates a standardized string that can be later used in a comparison or stored in a database, but also ensures that the data that is received on the server end contains only the expected data.This is important because most website attacks are caused by accepting user input blindly.I'm using this regular expression, First off, your format validator is obviously only appropriate for NANP (country code 1) numbers. I write this code by myself and I think this is very good way to use in input. It will help user to correct their format on input tag.

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