title: Regex that matches two sentences varying by one word
body: <p>I am looking for a regex that will match both of these examples:</p>
  
  <p><code>Hello I am really him.</code></p>
  
  <p><code>Hello I am him.</code></p>
  
  <p>In general, how do you set up a regex that matches both a string, and a subset of that string that is missing a word?</p>
  
  <p><strong>Update</strong>:</p>
  
  <p>So this was just an example sentence to see if I could reproduce the same pattern on my actual string. This didn't quite work however, so here they are.
  I need to match the sentence:</p>
  
  <p><code>Ulcerative colitis patient, biopsy taken from the descending colon, macroscopic inflammation vissible</code></p>
  
  <p>where the word <code>descending</code> may or not be there, and the word <code>no</code> might appear after the last comma. So it  might be:</p>
  
  <p><code>Ulcerative colitis patient, biopsy taken from the descending colon, macroscopic inflammation vissible</code>  </p>
  
  <p><code>Ulcerative colitis patient, biopsy taken from the descending colon, no macroscopic inflammation vissible</code></p>
  
  <p><code>Ulcerative colitis patient, biopsy taken from the colon, macroscopic inflammation vissible</code></p>
  
  <p><code>Ulcerative colitis patient, biopsy taken from the colon, no macroscopic inflammation vissible</code></p>