[O] LaTeX export filter

[Vikas Rawal]

Let me start by confessing my limited knowledge of lisp.

I am trying to write a LaTeX export filter that should replace all table rows 
with cells having entries such as <3cid4> by \cmidrule{lr}{3-4}

The idea is to have a table row of this kind

| <2cid3> |           <4cid5> |        <6cid7>             |                   
|                                           |                   |               
    |

Which should be exported to 

\cmidrule(lr){2-3} \cmidrule(lr){4-5} \cmidrule(lr){6-7}

This is as far as I have gone.

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(defun org-export-cmidrule-filter-latex (row backend info)
  (while (string-match
          "\\(<\\([0-9]+\\)cid\\([0-9]+\\)?>[[:blank:]]*\\([^&]+\\)\\)" row)
    (let ((start (string-to-number (match-string 2 row)))
          (end (or (match-string 3 row) "l")))
      (setq row (replace-match
                 (format "\\\\cmidrule(lr){%s-%s}" start end)
                 nil nil row 1))
      (while (string-match "& \\| \\\\\\\\" row 0)
        (setq row (replace-match "" nil nil row))
        (decf start))
      )
    )
  row)

------

The above filter works if I have only one or two <[0-9]cid[0-9]> strings in a 
row. It does not pick up the third <[0-9]cid[0-9]> string.

I would greatly appreciate if anyone could help improve this filter.

Vikas