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var a = /^[a-zA-Z]\w{5,17}$/i;
alert(a.test("abncdfe"));
//结果是 true
var b = "^[a-zA-Z]\w{5,17}$";
alert(new RegExp(b,"i").test("abncdfe"));
//这个结果却是 false
<script>
var a = /^[a-zA-Z]\w{5,17}$/i;
alert(a.test("abncdfe"));
//结果是 true
var b = "^[a-zA-Z]\\w{5,17}$";
alert(new RegExp(b,"i").test("abncdfe"));
</script>