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POHow to replace URLs not within a href tag in javascript
 

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  1. POHow to replace URLs not within a href tag in javascript
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    <p>I have a situation where I have text which contains URL links. The links are in 2 forms</p> <ol> <li>www.stackoverflow.com</li> <li>&lt;a href="http://www.stackoverflow.com"&gt;Stack over flow&lt;/a&gt;</li> </ol> <p>I am trying to create a simple function that uses regex that will wrap all links of type <strong>1</strong> with A HREF tag but leaving the other ones already wrapped a lone.</p> <p>I have something like this but not successful.</p> <pre><code>function replaceURLWithHTMLLinks(text) { var exp = /(&lt;(\s*)a(\s)*href.*&gt;.*&lt;\/(\s)*a(\s*)&gt;)/ig; var matches = exp.exec(text); for(var i=0; i &lt; matches.length; i++) { var line = matches[i]; if(!exp.test(line)) { var exp2 = /(\b(?:(?:(?:https?|ftp|file):\/\/|www\.|ftp\.)[-A-Z0-9+&amp;@#\/%?=~_|$!:,.;]*[-A-Z0-9+&amp;@#\/%=~_|$])|”(?:(?:https?|ftp|file):\/\/|www\.|ftp\.)[^"\r\n]+”?|’(?:(?:https?|ftp|file):\/\/|www\.|ftp\.)[^'\r\n]+’?)/ig; text = text.replace("http://",""); text = text.replace(exp2, "&lt;a href=http://$1&gt;$1&lt;/a&gt;"); } } return text; } </code></pre> <p>It's not working but hoping someone could fix it :)</p> <p><strong>EDIT</strong></p> <p>The solution that fixed it, with the help of @MikeM answer</p> <pre><code>function replaceLinksSO(text) { rex = /(&lt;a href=")?(?:https?:\/\/)?(?:(?:www)[-A-Za-z0-9+&amp;@#\/%?=~_|$!:,.;]+\.)+[-A-Za-z0-9+&amp;@#\/%?=~_|$!:,.;]+/ig; return text.replace(rex, function ( $0, $1 ) { if(/^https?:\/\/.+/i.test($0)) { return $1 ? $0: '&lt;a href="'+$0+'"&gt;'+$0+'&lt;/a&gt;'; } else { return $1 ? $0: '&lt;a href="http://'+$0+'"&gt;'+$0+'&lt;/a&gt;'; } }); } </code></pre>
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    1. COpossible duplicate of [How to replace plain URLs with links?](http://stackoverflow.com/questions/37684/how-to-replace-plain-urls-with-links)
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    2. CO@Dve not really a duplicate. I am trying to replace plain URLs with links only on the condition that the plain URL is not wrapped with a href tag. Because I am doing this on an HTML document. The other regex actually completely fails my test case.
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