title: Parse through list in python for string that starts with certain characters and is length N
body: <p>I tried to emulate this
  <a href="https://stackoverflow.com/questions/1427107/find-strings-of-length-10-with-regex">Find strings of length 10 with regex</a></p>
  
  <p>with this </p>
  
  <pre><code>for char in updated_metabolite:
      found_all = re.findall('^cpd.{5}$', updated_metabolite)
  </code></pre>
  
  <p>the list updated_metabolites looks like this before running the above code:</p>
  
  <pre><code>cpd00001;cpd00009;cpd00015;cpd00041;cpd00095;cpd00982;cpd02333
  cpd00001;cpd00003;cpd00004;cpd00067;cpd00075;cpd00985
  cpd00003;cpd00004;cpd00067;cpd15560;cpd15561
  cpd00005;cpd00006;cpd00067;cpd14938;cpd17051
  cpd00001;cpd00002;cpd00003;cpd00004;cpd00008;cpd00009;cpd00067;cpd00149;cpd03913;cpd03914
  cpd00005;cpd00006;cpd11669;cpd17097
  cpd00005;cpd00006;cpd00067;cpd00129;cpd02431
  cpd00001;cpd00015;cpd00067;cpd00129;cpd00858;cpd00982
  cpd00005;cpd00006;cpd00011;cpd00017;cpd00060;cpd00067;cpd00791;cpd02083;cpd03091;
  </code></pre>