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copied!<p>What about a pattern like this:</p> <pre><code>.*?\((CPT|ICD)-[A-Z0-9.]+\) </code></pre> <p>This will match zero or more of any character, non-greedily, followed by a <code>(</code> followed by either <code>CPT</code> or <code>ICD</code>, followed by a hyphen, followed by one or more Uppercase Latin letters, decimal digits or periods, followed by a <code>)</code>.</p> <p>Note that I picked <code>[A-Z0-9.]+</code> because, to my understanding, all current <a href="http://en.wikipedia.org/wiki/List_of_ICD-9_codes" rel="nofollow">ICD-9 codes</a> , <a href="http://en.wikipedia.org/wiki/ICD-10" rel="nofollow">ICD-10 codes</a>, and <a href="http://en.wikipedia.org/wiki/Current_Procedural_Terminology" rel="nofollow">CPT codes</a> conform to that pattern.</p> <p>The C# code might look a bit like this:</p> <pre><code>var result = Regex.Matches(input, @".*?\((CPT|ICD)-[A-Z0-9.]+\)") .Cast<Match>() .Select(m => m.Value); </code></pre> <p>If you want to avoid having any surrounding whitespace, you simply trim the result strings (<code>m => m.Value.Trim()</code>), or ensure that the matched prefix starts with a non-whitespace character by putting a <code>\S</code> in front, like this:</p> <pre><code>var result = Regex.Matches(input, @"\S.*?\((CPT|ICD)-[A-Z0-9.]+\)") .Cast<Match>() .Select(m => m.Value); </code></pre> <p>Or using a negative lookahead if you need to handle inputs like <code>(ICD-100)(ICD-200)</code>:</p> <pre><code>var result = Regex.Matches(input, @"(?!\s).*?\((CPT|ICD)-[A-Z0-9.]+\)") .Cast<Match>() .Select(m => m.Value); </code></pre> <p>You can see a working <a href="http://regexpal.com/?flags=g&regex=%28%3F!%5Cs%29.%2a%3F%5C%28%28CPT%7CICD%29-%5BA-Z0-9.%5D%2B%5C%29&input=SENSORINEURAL%20HEARING%20LOSS%20BILATERAL%20%28MILD%29%20%28ICD-389.18%29%20RIGHT%20WRIST%20GANGLION%20CYST%20%28ICD-727.41%29%20S%2FP%20INJECTION%20OF%20DEPO%20MEDROL%20INTO%20LEFT%20SHOULDER%20JOINT%20%28CPT-20600%29" rel="nofollow">demonstration here</a>.</p>

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