Clean Word markup

When writing a web-app that accepts formatted input from users, you’ll often find that they will copy and paste text from Microsoft Word. Unfortunately, Word fills the markup with lots of unnecessary and unwanted muck. To clean this all up, I wrote the following function (directly implemented on the String prototype below):

[sourcecode language=javascript]String.implement({
sanitiseWord: function() {
var s = this.replace(/\r/g, ‘\n’).replace(/\n/g, ‘ ‘);
var rs = [];
rs.push(//g); // Comments
rs.push(/.+?<\/title>/g); // Title<br /> rs.push(/<(meta|link|.?o:|.?style|.?div|.?head|.?html|body|.?body|.?span|!\[)[^>]*?>/g); // Unnecessary tags<br /> rs.push(/ v:.*?=”.*?”/g); // Weird nonsense attributes<br /> rs.push(/ style=”.*?”/g); // Styles<br /> rs.push(/ class=”.*?”/g); // Classes<br /> rs.push(/( ){2,}/g); // Redundant s<br /> rs.push(/</p><p>(\s| )*?<\/p>/g); // Empty paragraphs<br /> rs.each(function(regex) {<br /> s = s.replace(regex, ”);<br /> });<br /> return s.replace(/\s+/g, ‘ ‘);<br /> }<br /> });[/sourcecode]</p><p>If you’re not using MooTools, the function will look something like this:<br /> [sourcecode language=javascript]String.prototype.sanitiseWord = function() {<br /> // function body here…<br /> };[/sourcecode]</p><h2>Usage</h2><p>[sourcecode language=javascript]var s = “(some awful Word markup)”.sanitiseWord();[/sourcecode]</p><p>In one of the tests I ran, the input went from around 7000 characters to just 700.</p><h2>Example</h2><p><iframe data-lazyloaded="1" src="about:blank" style="width: 100%; height: 300px" data-litespeed-src="http://mootools.net/shell/26Jpf/embedded/"></iframe></p><p>Some of the regular expressions I used were adapted from C# ones in <a href="http://www.codinghorror.com/blog/archives/000485.html">a post by Jeff Atwood</a>.</p></div><div class="wp-block-group has-global-padding is-layout-constrained wp-block-group-is-layout-constrained" style="padding-top:var(--wp--preset--spacing--60);padding-bottom:var(--wp--preset--spacing--60)"></div><div class="wp-block-group alignwide is-layout-flow wp-block-group-is-layout-flow" style="margin-top:var(--wp--preset--spacing--60);margin-bottom:var(--wp--preset--spacing--60);"><nav class="wp-block-group alignwide is-content-justification-space-between is-nowrap is-layout-flex wp-container-core-group-is-layout-9b36172e wp-block-group-is-layout-flex" aria-label="Post navigation" 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