Node.js正则表达式：查找样式表中不在注释中的所有CSS属性

Question

I am trying to use regex to query all of the attributes inside of a CSS file. My end goal is to be able to take a css file like this:

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}

and return a list of selectors like this:

margin, padding, border, font-size, font, vertical-align, display, list-style, quotes, content, border-collapse, border-spacing

The first step is to create a regular expression than only matches all of the attributes in the css file, and only those that are not selectors (ie. a:hover) or inside of comments.

Right now all I have is /(?:([\\w\\d\\S\\-\\_]+)\\:)/g , which works, but still queries selectors and text inside of comments.

Answer 1

Try using String.prototype.replace() with RegExp /\\/\\*.*\\*\\/|(-moz-|-ms-|-o-|-webkit-)+\\w+(?=:)/g to match , remove comment text , vendor prefixes ; String.prototype.match() with RegExp /[az-]+(?=:[^before|after|hover])/ig to match characters "a" through "z" or "-" case insensitive, followed by ":" , not followed by "before" or "after"

 var style = document.querySelector("style"); var props = style.textContent // remove comments, vendor prefixes .replace(/\\/\\*.*\\*\\/|(-moz-|-ms-|-o-|-webkit-)+\\w+(?=:)/g,"") // negate `:hover` .match(/[az-]+(?=:[^before|after|hover])/ig); console.log(props) 

 html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video { margin: 0; padding: 0; border: 0; font-size: 100%; font: inherit; vertical-align: baseline; } /* HTML5 display-role reset for older browsers */ article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section { display: block; } body { line-height: 1; } ol, ul { list-style: none; } blockquote, q { quotes: none; } blockquote:before, blockquote:after, q:before, q:after { content: ''; /* duplicate `content` property here */ /* content: none; */ } table { border-collapse: collapse; border-spacing: 0; } table:hover { color:blue; -moz-animation: name 1s; } 

Answer 2

You may not need regular expressions for this.

You can access the stylesheet with JavaScript, then iterate over the stylesheet's cssRules object and split each declaration at ; then split each property/value pair at the : character.

It's worth pointing out that this method will expand the shorthand properties since the cssText property consists of the computed properties/values.

 function getPropertiesFromStylesheet(stylsheetIndex) { var stylesheet = document.styleSheets[stylsheetIndex], rules = stylesheet.cssRules, properties = []; if (stylesheet) { Object.keys(rules).forEach(function(key) { rules[key].style.cssText.split(';').forEach(function(declaration) { if (declaration) { properties.push(declaration.split(':')[0].trim()); } }); }); } return properties; } document.body.textContent = getPropertiesFromStylesheet(0); 

 html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video { margin: 0; padding: 0; border: 0; font-size: 100%; font: inherit; vertical-align: baseline; } /* HTML5 display-role reset for older browsers */ article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section { display: block; } body { line-height: 1; } ol, ul { list-style: none; } blockquote, q { quotes: none; } blockquote:before, blockquote:after, q:before, q:after { content: none; } table { border-collapse: collapse; border-spacing: 0; }