title: python regexp 3 the same pairs of [0-9A-Fa-f]
body: <p>I need a regex for some color which can be described like this:</p>
  
  <p>starts with #
  then 3 the same pairs of hex characters (0-9, a-f, A-F). aA and Aa are also the same pairs</p>
  
  <p>Now i have #(([0-9A-Fa-f]){2}){3}</p>
  
  <p>How can I make regexp for the SAME pairs of hex characters?</p>
  
  <p>Some examples of the matching strings:
  "#FFFFFF",
  "#000000",
  "#aAAaaA",
  "#050505",
  "###93#0b0B0b1B34"</p>
  
  <p>Strings like "#000100" shouldn't match</p>