无论如何都要删除fa之前的字符 - ？
[]
fa-deviantart
[]
fa-diamond
[]
fa-digg
[]
fa-dollar
(alias)
[]
fa-dot-circle-o
[]
fa-download
[]
fa-dribbble
[]
$(document).ready(function() {
// var myfa = "fa-";
// var findFA = myfa.substr(myfa.length - 3); // => "fa-"
$("textarea").val( $("div").html().replace(/fa-/g,".fa .fa-") );
$("div").html( $("textarea").val() );
});div {
white-space: pre-line;
position: absolute;
top: 200px;
top: 100px;
}
textarea {
position: absolute;
width: 90%;
left: 5%;
padding: 0;
height: 100px;
}<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="IE=9" />
<link type="text/css" rel="stylesheet" href="http://necolas.github.io/normalize.css/3.0.1/normalize.css" />
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
</head>
<body>
<textarea></textarea>
<div>
fa-bitcoin
(alias)
[]
fa-bold
[]
fa-bolt
[]
fa-bomb
[]
fa-book
[]
fa-bookmark
[]
fa-bookmark-o
[]
fa-briefcase
[]
fa-btc
[]
fa-bug
[]
fa-building
[]
fa-building-o
[]
fa-bullhorn
[]
fa-bullseye
[]
fa-bus
[]
fa-buysellads
[]
fa-cab
(alias)
[]
fa-calculator
[]
fa-calendar
[]
fa-calendar-o
[]
fa-camera
[]
fa-camera-retro
[]
fa-car
[]
fa-caret-down
[]
fa-caret-left
[]
fa-caret-right
[]
fa-caret-square-o-down
[]
fa-caret-square-o-left
[]
fa-caret-square-o-right
[]
fa-caret-square-o-up
[]
fa-caret-up
[]
fa-cart-arrow-down
[]
fa-cart-plus
[]
fa-cc
[]
fa-cc-amex
[]
fa-cc-discover
[]
fa-cc-mastercard
[]
fa-cc-paypal
[]
fa-cc-stripe
[]
fa-cc-visa
[]
fa-certificate
[]
fa-chain
(alias)
[]
fa-chain-broken
[]
fa-check
[]
fa-check-circle
[]
fa-check-circle-o
[]
fa-check-square
[]
fa-check-square-o
[]
fa-chevron-circle-down
[]
fa-chevron-circle-left
[]
fa-chevron-circle-right
[]
fa-chevron-circle-up
[]
fa-chevron-down
[]
fa-chevron-left
[]
fa-chevron-right
[]
fa-chevron-up
[]
fa-child
[]
fa-circle
[]
fa-circle-o
[]
fa-circle-o-notch
[]
fa-circle-thin
[]
fa-clipboard
[]
fa-clock-o
[]
fa-close
(alias)
[]
fa-cloud
[]
fa-cloud-download
[]
fa-cloud-upload
[]
fa-cny
(alias)
[]
fa-code
[]
fa-code-fork
[]
fa-codepen
[]
fa-coffee
[]
fa-cog
[]
fa-cogs
[]
fa-columns
[]
fa-comment
[]
fa-comment-o
[]
fa-comments
[]
fa-comments-o
[]
fa-compass
[]
fa-compress
[]
fa-connectdevelop
[]
fa-copy
(alias)
[]
fa-copyright
[]
fa-credit-card
[]
fa-crop
[]
fa-crosshairs
[]
fa-css3
[]
fa-cube
[]
</div>
</body>
</html>
答案 0 :(得分：2)
您可以使用正则表达式匹配以fa-开头的有效类名。
//A string you want to extract the classes from.
var exampleString = 'fa-deviantart[]fa-diamond[]';
//Extract the class names using a regex into an array.
var classList = exampleString.match(/fa\-[a-zA-Z0-9\-_]*/g);
//Create a new string from the array of matched classes.
alert(classList.join(' '));