Question

126

Validate phone number using javascript

rated 0 times [ 132] [ 6] / answers: 1 / hits: 198056 / 11 Years ago, thu, august 22, 2013, 12:00:00

I'm trying to validate phone number such as 123-345-3456 and (078)789-8908 using JavaScript.
Here is my code

function ValidateUSPhoneNumber(phoneNumber) {

  var regExp = /^(([0-9]{3}) |[0-9]{3}-)[0-9]{3}-[0-9]{4}/;

  var phone = phoneNumber.match(regExp);

  if (phone) {

    alert('yes');

    return true;

  }

  alert('no');

  return false;

}

I'm testing the function using ValidateUSPhoneNumber('123-345-34567') which has 5 digits before the last hyphen which is invalid as per regex. But the function returns true.
Can any one explain why?

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vaughns

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4 Years ago

answered 11 Years ago zaynerogerb · Accepted Answer

JavaScript to validate the phone number:

function phonenumber(inputtxt) {

  var phoneno = /^(?([0-9]{3}))?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/;

  if(inputtxt.value.match(phoneno)) {

    return true;

  }

  else {

    alert(message);

    return false;

  }

}

The above script matches:

XXX-XXX-XXXX

XXX.XXX.XXXX

XXX XXX XXXX

If you want to use a + sign before the number in the following way
+XX-XXXX-XXXX
+XX.XXXX.XXXX

+XX XXXX XXXX
use the following code:

function phonenumber(inputtxt) {

  var phoneno = /^+?([0-9]{2}))?[-. ]?([0-9]{4})[-. ]?([0-9]{4})$/;

  if(inputtxt.value.match(phoneno)) {

    return true;

  }  

  else {  

    alert(message);

    return false;

  }

}