From: Rick DeNatale <rick.denatale@...>
Date: 2006-10-12T23:20:51+09:00
Subject: Re: scanning strings, backward?

On 10/11/06, Eero Saynatkari <ruby-ml@kittensoft.org> wrote:
> On 2006.10.11 20:05, Bil Kleb wrote:
> > 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
>
> 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.

I believe that the OP doesn't want to search line 1707 backwards for
dt, he want's to search the file backwards starting at line 1707 (or
maybe 1706) for a line containing dt.


-- 
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/