title: Catch the relational operators with regex
body: <p>I have a string like this:</p>
  
  <pre><code>5 * ( {0,0} + {0,1} ) &gt;= 4 * ( {0,2} / {0,3} )
  </code></pre>
  
  <p>I managed to get the left and right parts of the string; relational operator in this case <strong>>=</strong></p>
  
  <p>I used in order to get <strong>+,-,*,/</strong> operators:</p>
  
  <pre><code>[\+\-\*/]
  </code></pre>
  
  <p>for <strong>{0,0}</strong> pairs:</p>
  
  <pre><code>\{\d*,\d*\}
  </code></pre>
  
  <p>There is one single part left I stuck: to get relational operators which are:
  <strong>&lt;,>,&lt;=,>=,==,!=</strong></p>
  
  <p>Can anyone help me to write the regex for it?</p>