From: Bil Kleb <Bil.Kleb@...>
Date: 2006-10-11T20:05:10+09:00
Subject: scanning strings, backward?

Hi,

I would like to automate a code cleanup task which involves
finding warning messages like,

  Warning: ../../LibF90/bc_inviscid.f90, line 1707:
   DT explicitly imported into BC_INVISCID_FLUX but not used
  detected at BC_INVISCID_FLUX@<end-of-statement>

and removing the offending unused import.

So, the tasks are roughly,

  1) Goto line 1707 of the file
  2) Search backward until line.match /\Wdt\W/i
  3) Remove /dt/i

I'm stuck on an elegant, i.e., Ruby, way to do the first
two steps.  Please point me toward the glittering light.

Thanks,
--
Bil Kleb
http://fun3d.larc.nasa.gov