Pattern pattern = Pattern.compile(“\\{C0\\}”);
Matcher matcher = pattern.matcher(“Price: [{C0}].”);
System.out.println(matcher.replaceAll(“€6.99″));
System.out.println(matcher.replaceAll(“$6.99″));
输出:
Price: [€6.99].
Exception in thread “main” java.lang.IndexOutOfBoundsException: No group 6
at java.util.regex.Matcher.group(Unknown Source)
at java.util.regex.Matcher.appendReplacement(Unknown Source)
at java.util.regex.Matcher.replaceAll(Unknown Source)
at TestExcel2Xml.main(TestExcel2Xml.java:10)

可见第一个replaceAll是正常工作的, 但第二个中的美元符号就出问题了.

Java API:
Note that backslashes (\) and dollar signs ($) in the replacement string may cause the results to be different than if it were being treated as a literal replacement string. Dollar signs may be treated as references to captured subsequences as described above, and backslashes are used to escape literal characters in the replacement string.

可以使用Matcher.quoteReplacement(String)对替换内容进行预先处理: (API)
Returns a literal replacement String for the specified String. This method produces a String that will work use as a literal replacement s in the appendReplacement method of the Matcher class. The String produced will match the sequence of characters in s treated as a literal sequence. Slashes (‘\’) and dollar signs (‘$’) will be given no special meaning.

修改为:

Pattern pattern = Pattern.compile(“\\{C0\\}”);
Matcher matcher = pattern.matcher(“Price: [{C0}].”);
System.out.println(matcher.replaceAll(“€6.99″));
System.out.println(matcher.replaceAll(Matcher.quoteReplacement(“$6.99″)));

正确输出:

Price: [€6.99].
Price: [$6.99].

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\\w+([-.]\\w+)*@\\w+([-.]\\w+)*\\.[a-z]{2,3}

可能不是最完美的, 但基本没大问题.

Java测试类一并奉上:

	//定义正则表达式
    private static final String REGEX_EMAIL = "\\w+([-.]\\w+)*@\\w+([-.]\\w+)*\\.[a-z]{2,3}";// \\w+([-.]\\w+)*";// "[\\w]+[\\w.]*@(\\w+\\.)+[A-Za-z]+"; // [\\w]+[\\w+.]+\\.\\w+"; //邮件检查正则表达式
    										// \w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String s = "x-d.x@d.d.dd-ddd3d.d.com.dd";
		System.out.println(s.matches(REGEX_EMAIL));
	}

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从给定的文字内容中 解析Email地址, 并显示出来. 同时支持QQ提取.

原理与代码:

Update: 正则表达式已更正, 参考: http://liguoliang.com/2011/validate-email-regex/

Flex使用正则表达式搜索内容

核心代码:

/** 当按下解析按钮时响应. */
		protected function onButtonParse(event:MouseEvent):void {
			var sourceStr:String = StringUtils.trim(textSource.text);
			var resultMap:Object = new Object();
			if(StringUtils.isEmptyString(sourceStr)) {
				Alert.show("请先输入要解析的字符");
				return;
			}

			textOutput.text = "";

			var patternEmail:RegExp = new RegExp("(([\\w\\.-]{1,})@([\\w-]{1,}\\.+[a-zA-Z]{2,}))", "g");
			var resultsRawEmail:Array = sourceStr.match(patternEmail);
			for each(var resultEmail:String in resultsRawEmail) {
				resultMap[resultEmail] = resultEmail;
			}

			if(checkBoxQQ.selected) {
				TextAreaUtils.appendMessageAndScrollProperly(textOutput, "本次解析会自动解析QQ号码, 并追加@qq.com");
				var patternQQ:RegExp = new RegExp("([1-9][\\d]{4,})", "g");
				var resultsRawQQ:Array = sourceStr.match(patternQQ);

				for each(var result:String in resultsRawQQ) {
					resultMap[result+ "@qq.com"] = result + "@qq.com";
				}
			}

			TextAreaUtils.appendMessageAndScrollProperly(textOutput, "解析完毕, 共获得: " + ObjectUtils.getSize(resultMap));

			for(var key:String in resultMap) {
				TextAreaUtils.appendMessageAndScrollProperly(textOutput, resultMap[key] + ", ", false);
			}
		}

		/** 当Linkbutton点击时响应. */
		protected function onLinkbuttonClick(event:MouseEvent):void {
			navigateToURL(new URLRequest("http://liguoliang.com"));
		}

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	/**
	 * 从String中通过正则表达式找到所有的Email地址.
	 * @param $str
	 * @return array 搜索到的Email地址组成的array.
	 */
	public static function parseEmails($str) {
		$emails = array();
		preg_match_all("(([\w\.-]{1,})@([\w-]{1,}\.+[a-zA-Z]{2,}))", $str, $matches, PREG_PATTERN_ORDER);

		// var_dump($matches);

		foreach($matches[0] as $email) {
			$emails[$email] = $email;
 		}
 		return $emails;
	}

$matches中包含所有搜索到的Group, 可使用不同的Pattern对得到的数组进行排序, 如上$matches[0]为最外部Group搜索到的字符.

详细可参阅:http://php.net/manual/en/function.preg-match-all.php

相关阅读:  

Eclipse 正则表达式书写测试插件 – 基于java.util.regex

Flex:使用正则表达式替换String

Java正则表达式使用笔记

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var regExp:RegExp = new RegExp("[^A-Za-z0-9_]", "g"); // 正则表达式, 将非字母数字或下划线的字符替换为"_", 全部替换.
		finalName = fileName.replace(regExp, "_");
		

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使用工具:

Eclipse 正则表达式书写测试插件 – 基于java.util.regex

2.

//定义正则表达式

//定义正则表达式
	private static final String REGEX_EMAIL = "([\\w\\.-]{1,})@(([\\w-]{1,}\\.)+[a-zA-Z]{2,})";	//Group1, 2;

3. 使用

Pattern patternEmail = Pattern.compile(REGEX_EMAIL);
java.util.regex.Matcher matcherEmail = patternEmail.matcher(data); 

        while (matcherEmail.find()) {
            String pb = matcherEmail.group(1);
            String pa = matcherEmail.group(2).toLowerCase();
,............
        }

其中data为string类型

该正则表达式将取得data中所有的email地址.

其中group1为@前的字符 group2为@之后的domain.

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Download the plugin

Last version: Download

Update site: http://regex-util.sourceforge.net/update/

更多信息: http://myregexp.com/eclipsePlugin.html

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