title: Regex expression to capture only words without numbers or symbols
body: <p>I need some regex that given the following string:</p>
  
  <pre><code>"test test3 t3st test: word%5 test! testing t[st"
  </code></pre>
  
  <p>will match only words in a-z chars:</p>
  
  <p>Should match: test testing</p>
  
  <p>Should not match: test3 t3st test: word%5 test! t[st</p>
  
  <p>I have tried <a href="https://stackoverflow.com/questions/40605550/regex-to-only-match-words-without-special-symbols-or-numbers">([A-Za-z])\w+</a> but word%5 should not be a match. </p>