如何在jquery或javascript中验证只有印度手机号码的输入域？

Question

我想验证的输入字段只与印度手机号码和输入字段应该包含91在开始时，尝试键入一个手机号码的输入，这个输入不应该超过10个数字后，91。所以，如果有人可以帮助我与jquery或javascript验证这一点。

<input id="mobileNumber" onkeypress="mobileValidation()" type="number">

  function mobileValidation()
    {
        var mobile = document.getElementById('mobileNumber').value;
        var regex = (/^91/.test(mobile) && (mobile.length<13));
        return regex;
    }

But what i want that it should show 91 at the starting when press any key on that input field.

Answer 1

​

function validateMobile(){
  var mobile=document.getElementById("mobile").value;
  
  // caclulate a boolean result:
  var result=(/^91/.test(mobile) && (mobile.length<13));

  //Do what you want with result      
  alert(result);
}

<input id="mobile">
<input type="submit" value="validate" onclick="validateMobile()">

​