title: How to extract values between 2 or more special characters using regex in R?
body: <pre><code>string_1 = "[1] \"  .. ..$ : chr [1, 1] \\\"DM_4CRSOL\\\"\""
  </code></pre>
  
  <p>How to extract 'DM_4CRSOL' from string_1 using regex in R?</p>
  
  <p>Thanks in advance. </p>