From: Eero Saynatkari <ruby-ml@...>
Date: 2006-10-12T02:42:24+09:00
Subject: Re: scanning strings, backward?

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On 2006.10.11 20:05, Bil Kleb wrote:
> Hi,
>=20
> I would like to automate a code cleanup task which involves
> finding warning messages like,
>=20
>  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>
>=20
> and removing the offending unused import.
>=20
> So, the tasks are roughly,
>=20
>  1) Goto line 1707 of the file

File.readlines for reasonably sized files, f.each_with_index
for skipping over until 1707.

>  2) Search backward until line.match /\Wdt\W/i
>  3) Remove /dt/i

Combine these by anchoring.

  line.sub /(.*\W)dt(\W.*)$/i, '\1\2'

If the \W are spaces, strip one of them out.

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