在Javascript中使用Regex删除HTML注释 [英] Remove HTML comments with Regex, in Javascript

问题描述

我从Word生成了一些丑陋的HTML，我想从中删除所有HTML注释。

I've got some ugly HTML generated from Word, from which I want to strip all HTML comments.

HTML看起来像这样：

The HTML looks like this:

<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:RelyOnVML/> <o:AllowPNG/> </o:OfficeDocumentSettings> </xml><![endif]--><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:HyphenationZone>21</w:HyphenationZone> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF/> <w:LidThemeOther>NO-BOK</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w:DontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <w:EnableOpenTypeKerning/> <w:DontFlipMirrorIndents/> <w:OverrideTableStyleHps/> </w:Compatibility> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="&#45;-"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]-->

..我正在使用的正则表达式是这一个

..and the regex I am using is this one

html = html.replace(/<!--(.*?)-->/gm, "")

但似乎没有匹配，字符串不变。

But there seems to be no match, the string is unchanged.

我是什么我失踪了？

推荐答案

正则表达式 /<！ - [\\\\ S] *？ - > / g 应该有效。

你要杀死转义文本范围。

例如

<script><!-- notACommentHere() --></script>

和格式化代码块中的文字文本

and literal text in formatted code blocks

<xmp>I'm demoing HTML <!-- comments --></xmp>

<textarea><!-- Not a comment either --></textarea>

编辑：

这也赢了' t阻止引入新评论

This also won't prevent new comments from being introduced as in

<!-<!-- A comment -->- not comment text -->

在一轮regexp之后会变成

which after one round of that regexp would become

<!-- not comment text -->

如果这是一个问题，你可以逃避< 不是注释或标记的一部分（很难得到）或者你可以循环和替换，如上所述直到字符串稳定下来。

If this is a problem, you can escape < that are not part of a comment or tag (complicated to get right) or you can loop and replace as above until the string settles down.

这是一个匹配评论的正则表达式，包括 psuedo-comments 和HTML-5规范中未公开的评论。 CDATA部分仅在外部XML中严格允许。这会遇到与上述相同的警告。

Here's a regex that will match comments including psuedo-comments and unclosed comments per the HTML-5 spec. The CDATA section are only strictly allowed in foreign XML. This suffers the same caveats as above.

var COMMENT_PSEUDO_COMMENT_OR_LT_BANG = new RegExp(
    '<!--[\\s\\S]*?(?:-->)?'
    + '<!---+>?'  // A comment with no body
    + '|<!(?![dD][oO][cC][tT][yY][pP][eE]|\\[CDATA\\[)[^>]*>?'
    + '|<[?][^>]*>?',  // A pseudo-comment
    'g');

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