<script language="javascript">
var str="abc123456";
if(str.match(/^[a-zA-Z]{3}[0-9]{6}$/)) alert("OK!");
</script>
var str="abc123456";
if(str.match(/^[a-zA-Z]{3}[0-9]{6}$/)) alert("OK!");
</script>
else alert("OK");
if(!(/^[a-z]{3}[0-9]{6}$/).test(str)) alert("Not match!");
else alert("OK");
/^[a-z]{3}\d{6}/i
应该是/^[a-z]{3}\d{6}$/i