title: Split line at the tab character
body: <p>I would like to split a line at tab and read commas as character. I tried to follow a solution of this kind, using a <code>pos</code> variable containing "\t" or " ", but it returns me 0, so it doesn't find any tab. Which could be the right solution?</p>
  
  <pre><code>INTEGER :: i, dots, commas, A, T, C, G, InDel, M, Z, L, s, sf, numsize, InDelSlide, pos, base, cov
  CHARACTER(len=1) :: ref
  CHARACTER(len=10000) :: arg, seq, qual
  CHARACTER(len=1024) :: buffer
  CHARACTER(len=6) :: num
  CHARACTER(len=5) chr
  
  READ(5,'(A)') buffer
  PRINT *, buffer
  pos = INDEX(buffer, "   ")
  arg = buffer(1:pos-1)
  READ(buffer(pos+1:), *) chr, base, ref, cov, seq, qual
  </code></pre>