funcion isEmail javascript

Código Javascript

<pre>
/**********
Checks if an email is correct
Input: Mail to validate
Output : True if email is correct. False otherwise.
******** */
function isMail(_email) {
     var emailReg = /^[a-z][a-z-_0-9\.]+@[a-z-_=>0-9\.]+\.[a-z]{2,3}$/i
     return emailReg.test(_email);
  }
</pre>