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js之正则表达式回溯的示例分析-创新互联

这篇文章主要介绍了js之正则表达式回溯的示例分析，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。

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当一个正则表达式扫描目标字符串时，从左到右逐个扫描正则表达式的组成部分，在每个位置上测试能不能找到一个匹配。对于每一个量词和分支，都必须确定如何继续进行。如果是一个量词（如*、+?或者{2,}），那么正则表达式必须确定何时尝试匹配更多的字符；如果遇到分支（通过|操作符），那么正则表达式必须从这些选项中选择一个进行尝试。

当正则表达式做出这样的决定时，如果有必要，它会记住另一个选项，以备返回后使用。如果所选方案匹配成功，正则表达式将继续扫描正则表达式模板，如果其余部分匹配也成功了，那么匹配就结束了。但是，如果所选择的方案未能发现相应匹配，或者后来的匹配也失败了，正则表达式将回溯到最后一个决策点，然后在剩余的选项中选择一个。继续这样，直到找到一个匹配，或者量词和分支选项的所有可能的排列组合都尝试失败后放弃这一过程，然后移动到此过程开始位置的下一个字符上，重复此过程。

例如，下面的代码演示了这一过程是如何通过回溯处理分支的。

/h(ello|appy) hippo/.test("hello there, happy hippo");

上面一行正则表达式用于匹配“hello hippo”或“happy hippo”。测试一开始要查找一个h，目标字符串的第一个字母恰好就是h，立刻就找到了。接下来，子表达式（ello|appy）提供了两个处理选项。正则表达式选择最左边的选项（分支选择总是从左到右进行），检查ello 是否匹配字符串的下一个字符，确实匹配，然后正则表达式又匹配了后面的空格。

然而，在接下来的匹配中正则表达式“走进了死胡同”，因为hippo 中的h 不能匹配字符串中的下一个字母t。此时正则表达式还不能放弃，因为它还没有尝试过所有的选择，随后它回溯到最后一个检查点（在匹配了首字母h 之后的那个位置上）并尝试匹配第二个分支选项。但由于匹配没有成功，而且也没有更多的选项了，正则表达式认为从字符串的第一个字符开始匹配是不能成功的，因此它从第二个字符开始重新进行查找。正则表达式没有找到h，继续向后找，直到第14 个字母才找到，它匹配happy 的那个h。随后正则表达式再次进入分支过程，这次ello 未能匹配，但在回溯之后的第二次分支中，它匹配了整个字符串“happy hippo”，匹配成功了。

再如，下面代码演示了带重复量词的回溯。

var str = "
Para 1.
" +"" +"
Para 2.
" +"
Div.
";
/
.*<\/p>/i.test(str);

正则表达式先匹配了字符串开始的3个字母

，然后是.*。点号表示匹配除换行符以外的任意字符，星号这个“贪婪”量词表示重复零次或多次，匹配尽量多的次数。因为目标字符串中没有换行符，正则表达式将匹配剩下的全部字符串！不过由于正则表达式模板中还有更多内容需要匹配，所以正则表达式尝试匹配<。由于在字符串末尾匹配不成功，因此每次回溯一个字符，继续尝试匹配<，直到正则表达式回到

标签的<位置。接下来尝试匹配\/（转义反斜杠），匹配成功，然后匹配p，匹配不成功。正则表达式继续回溯，重复此过程，直到第二段末尾时终于匹配了

。匹配返回成功需要从第一段头部一直扫描到最后一个的末尾，这可能不是我们想要的结果。

将正则表达式中的“贪婪”量词*改为“懒惰”（又名“非贪婪”）量词*?，以匹配单个段落。“懒惰”量词的回溯工作以相反方式进行。当正则表达式/

.*?<\/p>/推进到.*?时，首先尝试全部跳过，然后继续匹配<\/p>。

这样做是因为*?匹配零次或多次，尽可能少重复，尽可能少意味着可以重复零次。但是，当随后的<在字符串的这一点上匹配失败时，正则表达式回溯并尝试下一个最小的字符数：1个。正则表达式继续像这样向前回溯到第一段的末尾，在那里量词后面的<\/p>得到完全匹配。

如果目标字符串只有一个段落，那么此正则表达式的“贪婪”版本和“懒惰”版本是等价的，但尝试匹配的过程不同。

当一个正则表达式占用浏览器几秒甚至更长时间时，问题原因很可能是回溯失控。为说明此问题，给出下面的正则表达式，它的目标是匹配整个HTML文件。此表达式被拆分成多行是为了适合页面显示。与其他正则表达式不同，JavaScript在没有选项时可使点号匹配任意字符，包括换行符，所以此例中以[\s\S]匹配任意字符。

/[\s\S]*?[\s\S]*?[\s\S]*?<\/title>[\s\S]*?<\/head>
[\s\S]*?<body>[\s\S]*?<\/body>[\s\S]*?<\/html>/</pre><p>此正则表达式匹配在正常HTML 字符串时工作良好，但当目标字符串缺少一个或多个标签时，就会变得十分糟糕。例如</html>标签缺失，最后一个[\s\S]*?将扩展到字符串的末尾，因为在那里没有发现</html>标签，然后正则表达式将查看此前的[\s\S]*?队列记录的回溯位置，使它们进一步扩大。正则表达式尝试扩展倒数第二个[\s\S]*?—用它匹配</body>标签，就是此前匹配过正则表达式模板<\/body>的那个标签，然后继续查找第二个</body>标签，直到字符串的末尾。当所有这些步骤都失败时，倒数第三个[\s\S]*?将被扩展，直至字符串的末尾，依此类推。</p><p>此类问题的解决办法在于尽可能具体地指出分隔符之间的字符匹配形式，如模板“.*?”用于匹配双引号包围的一个字符串。用更具体的[^"\rn]*取代过于宽泛的.*?就去除了回溯时可能发生的几种情况，如尝试用点号匹配引号，或者扩展搜索超出预期范围。</p><p>在HTML 的例子中解决办法不是那么简单。不能使用否定字符类型，如用[^<]替代[\s\S]，因为在搜索过程中可能会遇到其他类型的标签。但是，可以通过重复一个非捕获组来达到同样效果，它包含一个回溯（阻塞下一个所需的标签）和[\s\S]（任意字符）元序列。这样可以确保中间位置上查找的每个标签都会失败。然后，更重要的是，[\s\S]模板在回溯过程中阻塞的标签在被发现之前不能被扩展。应用此方法后对正则表达式的最终修改如下：</p><pre>/<html>(?:(?!<head>)[\s\S])*<head>(?:(?!<title>)[\s\S])*<title>

(?:(?!<\/title>)[\s\S])*<\/title>(?:(?!<\/head>)[\s\S])*<\/head>

(?:(?!<body>)[\s\S])*<body>(?:(?!<\/body>)[\s\S])*<\/body>
(?:(?!<\/html>)[\s\S])*<\/html>/</pre><p>虽然这样做消除了潜在的回溯失控，并允许正则表达式在匹配不完整HTML字符串失败时的使用时间与文本长度呈线性关系，但是正则表达式的效率并没有提高。像这样为每个匹配字符进行多次前瞻，缺乏效率，而且成功匹配过程也相当慢。匹配较短字符串时使用此方法相当不错，而匹配一个HTML 文件可能需要前瞻并测试上千次。</p><p>感谢你能够认真阅读完这篇文章，希望小编分享的“js之正则表达式回溯的示例分析”这篇文章对大家有帮助，同时也希望大家多多支持创新互联<a href="https://www.cdcxhl.com/" target="_blank">网站建设公司</a>，，关注创新互联行业资讯频道，更多相关知识等着你来学习!</p>        <br>
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	<li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\BuildLiteBehavior [ RunTime:0.000017s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_init ] --END-- [ RunTime:0.000082s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000125s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_begin ] --END-- [ RunTime:0.000175s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ContentReplaceBehavior [ RunTime:0.000213s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ template_filter ] --END-- [ RunTime:0.000300s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\ParseTemplateBehavior [ RunTime:0.011595s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_parse ] --END-- [ RunTime:0.011645s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --START--</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000073s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ view_filter ] --END-- [ RunTime:0.000090s ]</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[ app_end ] --START--</li>    </ol>
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        <div style="display:none;">
    <ol style="padding: 0; margin:0">
	<li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1  </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1  </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1
 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) </li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: pid /home/wwwroot/bluegullmedia/wwwroot/App/Home/Controller/ArticleController.class.php 第 47 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] mkdir(): Permission denied /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 59 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[2] mkdir(): Permission denied /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 59 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_host /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Db.class.php 第 120 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_port /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Db.class.php 第 121 行.</li><li style="border-bottom:1px solid #EEE;font-size:14px;padding:0 12px">[8] Undefined index: db_name /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Db.class.php 第 122 行.</li>    </ol>
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        <div style="display:none;">
    <ol style="padding: 0; margin:0">
	    </ol>
    </div>
        <div style="display:none;">
    <ol style="padding: 0; margin:0">
	    </ol>
    </div>
    </div>
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