title: Error [] invalid range
body: <p>I am getting a range error while matching regular expressions with terms like below: </p>
  
  <pre><code>(5r)-6-(4-{[2-(3-Iodobenzyl)-3-Oxocyclohex-1-En-1-Yl]Amino}Phenyl)-5-Methyl-4,5-Dihydropyridazin-3(2h)-One
  
  show range error at 2-(
  </code></pre>
  
  <p>Can somebody tell me how to turn off the effect of such characters like brackets, range operator etc.?</p>