如何使用Flex RegExpValidator-优快云博客

本文介绍了一个使用 Flex 中的 RegExpValidator 进行文本验证的例子。通过输入待搜索的文本及正则表达式，点击按钮触发验证过程，结果显示匹配的索引及其对应的字符串。此示例有助于理解 RegExpValidator 的工作原理。

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<?xml version="1.0"?> 
<!-- Simple example to demonstrate the RegExpValidator. -->
<!--
	如何使用Flex RegExpValidator
	MyShareBook.cn 翻译
-->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">

	<mx:Script>
		<![CDATA[
			import mx.events.ValidationResultEvent;
			import mx.validators.*;

            // Write the results to the 
			private function handleResult(eventObj:ValidationResultEvent):void {
				if (eventObj.type == ValidationResultEvent.VALID)
				{
					// For valid events, the results Array contains
					// RegExpValidationResult objects.
					var xResult:RegExpValidationResult;
					reResults.text="";
					for (var i:uint = 0; i < eventObj.results.length; i++)
					{
						xResult = eventObj.results[i];
						reResults.text=reResults.text + xResult.matchedIndex + " " +
							xResult.matchedString + "\n";
					}
				}
				else
				{
					reResults.text="";			
				}		
			}
		]]>
	</mx:Script>

	<mx:RegExpValidator id="regExpV" 
		source="{regex_text}" property="text" 
		flags="g" expression="{regex.text}" 
		valid="handleResult(event)" invalid="handleResult(event)"
		trigger="{myButton}" triggerEvent="click"/>

   <mx:Panel title="RegExpValidator Example" width="95%" height="95%" 
        paddingTop="5" paddingLeft="5" paddingRight="5" paddingBottom="5">

        <mx:Text width="100%" text="Instructions:"/>
        <mx:Text width="100%" text="1. Enter text to search. By default, enter  a string containing the letters ABC in sequence followed by any digit."/>
        <mx:Text width="100%" text="2. Enter the regular expression. By default, enter ABC\d."/>
        <mx:Text width="100%" text="3. Click the Button control to trigger the validation."/>
        <mx:Text width="100%" text="4. The results show the index in the text where the matching pattern begins, and the matching pattern. "/>

        <mx:Form>
            <mx:FormItem label="Enter text: ">
                <mx:TextInput id="regex_text" text="xxxxABC4xxx" width="100%"/>
            </mx:FormItem>

            <mx:FormItem label="Enter regular expression: ">
                <mx:TextInput id="regex" text="ABC\d" width="100%"/>
            </mx:FormItem>

            <mx:FormItem label="Results: ">
                <mx:TextInput id="reResults" width="100%"/>
            </mx:FormItem>

            <mx:FormItem >
                <mx:Button id="myButton" label="Validate"/>
            </mx:FormItem>
        </mx:Form>
	</mx:Panel>
</mx:Application>