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    <p>Note that this question isn't about parsing. This is lexing. Something that regex are regularly and properly used for.</p> <p>If you want to go with regex there are a couple of ways you could do this.</p> <ul> <li><p>A simple hack lookahead like:</p> <pre><code>a(?![^&lt;&gt;]*&gt;) </code></pre> <p>note that this wont handle <code>&lt;</code> and <code>&gt;</code> quoted in tags/unescaped outside of tags properly.</p></li> <li><p>A full blown tokenizer of the form:</p> <pre><code>(expression for tag|comments|etc)|(stuff outside that that i'm interested in) </code></pre> <p>Replaced with a function that does different things depending on which part was matched. If <code>$1</code> matched it would be replaced by it self, if <code>$2</code> matchehd replace it with <code>*$2*</code></p></li> </ul> <p><br> The full tokenizer way is of course not a trivial task, the <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/tokenization.html" rel="nofollow noreferrer">spec isn't small</a>.</p> <p>But if simplifying to only match the basic tags, ignore CDATA, comments, script/style tags, etc, you could use the following:</p> <pre><code>var str = '&lt;span class="a &lt;lal&gt; a" attr&gt;habbitant 2 &gt; morbi. 2a &lt; 3a&lt;/span&gt; triastbbitique'; var re = /(&lt;[a-z\/](?:"[^"]*"|'[^']*'|[^'"&gt;]+)*&gt;)|(a)/gi; var res = str.replace(re, function(m, tag, a){ return tag ? tag : "*" + a + "*"; }); </code></pre> <p>Result:</p> <pre><code>&lt;span class="a &lt;lal&gt; a" attr&gt;h*a*bbit*a*nt 2 &gt; morbi. 2*a* &lt; 3*a*&lt;/span&gt; tri*a*stbbitique </code></pre> <p>This handles messy tags, quotes and unescaped <code>&lt;</code>/<code>&gt;</code> in the HTML.</p> <p><br> Couple examples of tokenizing HTML tags with regex (which should translate fine to JS regex):</p> <ul> <li><a href="https://stackoverflow.com/questions/9462104/remove-on-js-event-attributes-from-html-tags/9466152#9466152">Remove on* JS event attributes from HTML tags</a></li> <li><a href="https://stackoverflow.com/questions/9494143/regex-to-allow-only-set-of-html-tags-and-attributes/9499761#9499761">Regex to allow only set of HTML Tags and Attributes</a></li> </ul>
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