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    <h1>Short 'n Sweet</h1> <pre><code>function escapeRegExp(string) { return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&amp;'); // $&amp; means the whole matched string } </code></pre> <p><strong>Example</strong></p> <pre><code>escapeRegExp("All of these should be escaped: \ ^ $ * + ? . ( ) | { } [ ]"); &gt;&gt;&gt; "All of these should be escaped: \\ \^ \$ \* \+ \? \. \( \) \| \{ \} \[ \] " </code></pre> <p><strong>Install</strong></p> <p>Available on npm as <a href="https://www.npmjs.com/package/escape-string-regexp" rel="noreferrer">escape-string-regexp</a></p> <pre><code>npm install --save escape-string-regexp </code></pre> <p><strong>Note</strong></p> <p>See <a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions" rel="noreferrer">MDN: Javascript Guide: Regular Expressions</a></p> <p>Other symbols (~`!@# ...) MAY be escaped without consequence, but are not required to be.</p> <p>.</p> <p>.</p> <p>.</p> <p>.</p> <h2>Test Case: A typical url</h2> <pre><code>escapeRegExp("/path/to/resource.html?search=query"); &gt;&gt;&gt; "\/path\/to\/resource\.html\?search=query" </code></pre> <h1>The Long Answer</h1> <p>If you're going to use the function above at least link to this stack overflow post in your code's documentation so that it doesn't look like crazy hard-to-test voodoo.</p> <pre><code>var escapeRegExp; (function () { // Referring to the table here: // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/regexp // these characters should be escaped // \ ^ $ * + ? . ( ) | { } [ ] // These characters only have special meaning inside of brackets // they do not need to be escaped, but they MAY be escaped // without any adverse effects (to the best of my knowledge and casual testing) // : ! , = // my test "~!@#$%^&amp;*(){}[]`/=?+\|-_;:'\",&lt;.&gt;".match(/[\#]/g) var specials = [ // order matters for these "-" , "[" , "]" // order doesn't matter for any of these , "/" , "{" , "}" , "(" , ")" , "*" , "+" , "?" , "." , "\\" , "^" , "$" , "|" ] // I choose to escape every character with '\' // even though only some strictly require it when inside of [] , regex = RegExp('[' + specials.join('\\') + ']', 'g') ; escapeRegExp = function (str) { return str.replace(regex, "\\$&amp;"); }; // test escapeRegExp("/path/to/res?search=this.that") }()); </code></pre>
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    1. POEscape string for use in Javascript regex
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    1. COWow, that's verbose. I prefer [bobince's version](http://stackoverflow.com/a/3561711/157247). But anything that works without escaping things unnecessarily...
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    2. COI expect all of the characters that SHOULD be escaped, not just the ones that MUST be escaped, which is what linters such as JSLint undersand.
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    3. COIf someone knows please: Why is `/` to be escaped ? Its not in the list of characters, but it is in the regex both in this example and in the included MDN page's regex ?
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