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    <p>Here is a regex that will work for all your cases:</p> <pre><code>([a-z]+([,-][a-z]+)*|\*)(:([a-z]+)([,-][a-z]+)*|\*)* </code></pre> <p>Here is a detailed analysis:</p> <p>One of the basic structures used to build complicated regular expressions like this is actually pretty simple, and has the form <em><code>text</code></em><code>(</code><em><code>separator text</code></em><code>)*</code>. A regex of that form will match:</p> <ul> <li>one <em>text</em></li> <li>one <em>text</em>, a <em>separator</em>, and another <em>text</em></li> <li>one <em>text</em>, a <em>separator</em>, another <em>text</em>, another <em>separator</em>, and yet another <em>text</em></li> <li>or more, just add another <em>separator</em> and a <em>text</em> to the end.</li> </ul> <p>So here is a breakdown of the code:</p> <ul> <li><code>[a-z]+([,-][a-z]+)*</code> is an instance of the pattern I discussed above: the <em>text</em> here is <code>[a-z]+</code>, and the <em>separator</em> is <code>[,-]</code>.</li> <li><code>([a-z]+([,-][a-z]+)*|\*)</code> allows an asterisk to be matched instead.</li> <li><code>([a-z]+([,-][a-z]+)*|\*)(:([a-z]+([,-][a-z]+)*|\*))*</code> is another instance of the pattern I discussed above: the <em>text</em> is <code>([a-z]+([,-][a-z]+)*|\*)</code>, and the <em>separator</em> is <code>:</code>.</li> </ul> <p>If you plan to use this as a component of an even larger regex, in which the group matches will be important, I would recommend making the internal parens non-grouping, and place grouping parens around the entire regex, like so:</p> <pre><code>((?:[a-z]+(?:[,-][a-z]+)*|\*)(?::([a-z]+)(?:[,-][a-z]+)*|\*)*) </code></pre>
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    1. COSince the OP is learning regex, it would probably be beneficial to break this down and explain it's different components.
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    2. COIf you don't mind breaking it down that would be hugely helpfull
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    3. CO@RyanWH Finished breaking it down.
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