Re: Re: Need help with search-and-replace - Mailing list pgsql-sql

From tjk@tksoft.com
Subject Re: Re: Need help with search-and-replace
Date
Msg-id 200105071632.JAA11645@smtp3.tksoft.com
Whole thread Raw
In response to Need help with search-and-replace  ("Josh Berkus" <josh@agliodbs.com>)
List pgsql-sql
I am sure someone already sent this reply and I missed it.

Anyway, if I understand the original problem correctly, you want to
find instances of "\t\t00:00:00" and "\t\t\t\t\t\t\t00:00:00", etc. and 
remove them. 

I hope this is generic enough so you can change it to fit your needs:

echo "Start c     00:00:00crap here." | sed "s/\([^   ]*\)[ ]\+[0-9][0-9]:[0-9][0-9]:[0-9][0-9]\(.*\)/\1\2/g"


This will find an instance of "nn:nn:nn" only when preceded by more than one
tab.

Perl is easier to read, so here is a perlish version:
echo "Start c     00:00:00crap here." | {perlish} "s/([^\t]*)[\t]+\d\d:\d\d:\d\d(.*)/$1$2/g"


Troy


> 
> There are oh-so-many ways, as I am sure people will tell you.  regular
> expressions are the most wonderful things for such a task.  I am comfortable
> with tcl, so I would read the file into a tcl variable and use 'regsub -all
> {\t700:00:00} $instring {} outstring'.
> 
> There are unbelievably simple, unvbelievably fast ways to do this in one line
> from the shell using sed, but I don't speak sed.  I suspect someone will hook
> you up with some basic sed.
> 
> Try this in Windows.  Visual Basic can use regular expressions, but you have to
> instantiate a regular expression object, then execute one of it's methods to do
> anything.  Ugh.
> 
> Ian
> 
> Josh Berkus wrote:
> 
> > Folks,
> >
> >         I need to strip certain columns out of my pgdump file.  However, I
> > can't figure out how to use any Unix-based tool to search-and-replace a
> > specific value which includes a tab character (e.g. replace "{TAB}7
> > 00:00:00" with "" to eliminate the column).
> >
> >         RIght now, I'm copying the file to a Win32 machine and using MS Word
> > for the search-and-replace, but I'm sure there's got to be a better way
> > ... *without* learning VI or Emacs.  Help?
> >
> >                                         -Josh
> >
> > ______AGLIO DATABASE SOLUTIONS___________________________
> >                                        Josh Berkus
> >   Complete information technology      josh@agliodbs.com
> >    and data management solutions       (415) 565-7293
> >   for law firms, small businesses        fax 621-2533
> >     and non-profit organizations.      San Francisco
> >
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