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    <p>Here's a revised answer based on your comments. I think it does what you need since it deals with missing quotes too.</p> <pre><code>function q(str) { return (/\s/g).test(str) ? str.replace(/^"?(.*?)"?$/, function(str, value) { return '"' + value + '"'; }) : str; } </code></pre> <p><strong>DEMO:</strong> <a href="http://jsbin.com/apeva3/edit" rel="nofollow">http://jsbin.com/apeva3/edit</a></p> <p>Explanation:</p> <p>Pass it a string and it will add the double quotes as needed </p> <ol> <li>If the string has whitespace <code>(/\s/g).test</code></li> <li>Replace everything that is not a starting " or and ending " <ul> <li>replace can take a lambda function, it passes the whole matched string and then each group <code>function(str /*whole string*/, value /* group 1 */)</code></li> <li>the string is replaced by whatever the lambda returns</li> <li>in this case the replace returns whatever isn't in quotes surrounded by quotes</li> </ul></li> </ol> <hr> <p><strong>Old Answer</strong></p> <p>Your whitespace test looks good. For quotes try this:</p> <pre><code>/^(['"])​​​​​​​​​​​​​​.*?\1$/​​​​​​​​​​​​​​​​​ </code></pre> <p>Here is how it works:</p> <ol> <li>If the first character is ' or " match it and remember the value <code>^(['"])</code></li> <li>Now match any number of characters non-greedily <code>.*?</code></li> <li>Then match what was remembered before <code>\1</code></li> <li>And the end of the line <code>$</code></li> </ol>
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