title: Regex expression Giving all letters
body: <p>I need all groups of 4 capital letters in a string.</p>
  
  <p>So I am using <code>REGEXP_REPLACE([Description],'\b(?![A-Z]{4}\b)\w+\b',' ')</code> 
   in <code>Tableau</code> to replace all small letters and extra characters. I want to get only instances of capital letters with 4 string length.</p>
  
  <p>By google I got to know i cannot use Regex_extract (Since /g is not supported)</p>
  
  <p>My String:</p>
  
  <p><code>"The following trials have no study data-available, in the RBM mart. It appears as is this because they were . In y HIWEThe trials currently missing data are:
  JADA, JPBD, JVCS, JADQ, JVDI, JVDO, JVTZ"</code></p>
  
  <p>I have written <code>[^A-Z]{4}/g</code>.</p>
  
  <p>I want:</p>
  
  <p><code>HIWE JADA JPBD JVCS JADQ JVDI JVDO JVTZ</code></p>
  
  <p>But this is also giving me single capital letter and space included.</p>
  
  <p>Thanks</p>