match for email checking

I have this command to check for valid email address. I just found out that when I try to add this to our email server (all email requests off this form are local email addresses), the email server does not allow a numeric character to start the email address/username. I have read through all the documentation for the command preg_match and cannot find how to make it fail if it starts with a numeric in the first character location. I am a newbie so any help would be appreciated.

if (!preg_match("(^[-w.]+@([-a-z0-9]+.)+[a-z]{2,4}$)i", $in_email))

---

Try this one;

/^[^0-9][_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3})$/

And use as follows

$regex = '/^[^0-9][_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3})$/';

if (preg_match($regex, $email)) {
    // Valid email
} else { 
    // Invalid email
}

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