flex 正则表达式对空字符串的诡异判断

原创于 2014-01-28 09:58:50 发布 · 1.5k 阅读

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本文探讨了Flex中使用RegExpValidator进行验证的细节。通过实例展示了当设置为特定正则表达式时，验证器如何处理空字符串及null值的情况。

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
				minWidth="955" minHeight="600" layout="absolute"
				creationComplete="application1_creationCompleteHandler(event)">
	<mx:Script>
		<![CDATA[
			import mx.events.FlexEvent;
			// when the RegExpValidator is set require = false and the test = "", it won't do the validator!
			protected function application1_creationCompleteHandler(event:FlexEvent):void
			{
				var regExp:RegExp = new RegExp("^[A-Za-z0-9]{1,8}$");
				trace(regExp.test("")); // false;
				trace(regExp.test(null)); // true !!!!!!!!!!!!!!!!!!!
			}
			
		]]>
	</mx:Script>
	
</mx:Application>