Code:
var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
var checkStr = theForm.Alias.value;
var allValid = true;
for (i = 0;  i < checkStr.length;  i++) {
	ch = checkStr.charAt(i);
	for (j = 0;  j < checkOK.length;  j++)
	if (ch == checkOK.charAt(j))
	break;
	if (j == checkOK.length) {
		allValid = false;
		break;
	}
}

if (!allValid) {
	alert("Please enter only letter and numeric characters in the \"Alias\" field.");
	theForm.Alias.focus();
	return (false);
}
Can this be modified to test for a specific order of characters/digits?

I'd like to test for format: A1234567
- First character is alpha (A-Z, a-z)
- Next 7 characters are digits (0-9)

I can do this in PHP, but I'd like to know how to make it work in Javascript.

thanks!