title: use regex vim with tagbar to get filename of graphic in latex
body: <p>I'm using vim and tagbar to write my latex files. 
  In the latex source, the input for a graphic look like this:</p>
  
  <pre><code>\includegraphics[width=0.70\textwidth]{../../figures/mechanical_diffusion/plate_hole/plate_hole_fem_elas_cd_map}
  </code></pre>
  
  <p>I would like to get in tagbar only the filename, in this case, "plate_hole_fem_elas_cd_map".
  I created a .ctags in my home, which has the following line (modified from the original line found in tagbar documentation):</p>
  
  <pre><code>--regex-latex=/^[\t]*\\includegraphics[[:space:]]*(\[[^]]*\])?[[:space:]]*(\[[^]]*\])?[[:space:]]*\{[\.{2}\/]*[[a-zA-Z0-9_]+\/]*([^}]+)\}/\3/g,graphic+listing/
  </code></pre>
  
  <p>But I cannot get only the file name. I tried other things, but sometimes I only remove the "../", sometimes I get only "plate_hole"..
   What did I do wrong ?</p>
  
  <p>Thanks</p>