首先，我们先看几个实际的例子： 
1． 验证输入字符是否
javascript: 
var ex = "^w+$"; 
var re = new RegExp(ex,"i"); 
return re.test(str); 

VBScript 

Dim regEx,flag,ex 

ex = "^w+$" 

Set regEx = New RegExp 

regEx.IgnoreCase = True 

regEx.Global = True