正则表达式

Question

我在用正则表达式的时候，定义如下：
var pattern=/\d{2,5}/
为什么当输入的数值超过5位了才不给我报错，难道我设错了，应该怎么设？

Answer 1

呵呵，没有限制起止标志！L@_@K  <script type="text/javascript">
  <!--
    var pattern=/^\d{2,5}$/;
    var numA = "123";
    var numB = "1";
    var numC = "123456";
    alert(pattern.test(numA));
    alert(pattern.test(numB));
    alert(pattern.test(numC));
  //-->
  </script>

Answer 2

L@_@K  <script type="text/javascript">
  <!--
    var pattern=/^\d{2,5}.?\d{1,2}$/;
    var numA = "123.12";
    var numB = "1.";
    var numC = "123456.123";
    alert(pattern.test(numA));
    alert(pattern.test(numB));
    alert(pattern.test(numC));
  //-->
  </script>

Answer 3

Sorry, 弄错了，重发！  <script type="text/javascript">
  <!--
    var pattern=/^\d{2,5}(\.\d{1,2})?$/;
    var numA = "123.12";
    var numB = "123456";
    var numC = "123456.12";
    alert(pattern.test(numA));
    alert(pattern.test(numB));
    alert(pattern.test(numC));
  //-->
  </script>

Answer 4

其实不简单呢
<script type="text/javascript">
  <!--
    var pattern=/^(\d{2,3}(\.\d{2})?|\d{4}(\.\d)?|\d{5})$/;
    var numA = "123.12";
    var numB = "123456";
    var numC = "1236.12";
    alert(pattern.test(numA));
    alert(pattern.test(numB));
    alert(pattern.test(numC));
  //-->
  </script>