Flex 校验 文本框
<mx:TextInput id="userName" maxChars="4" restrict="a-zA-Z" />
restrict属性确实可以输入正则表达式，进行输入的验证。
但是在程序执行的时候如果为userName.text = "999"还是可以成功的。
待续。。。。学习中。。。
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