From: Suraj Kurapati <snk@...>
Date: 2007-05-04T03:16:37+09:00
Subject: Re: search and replace text in files

Phil Swenson wrote:
> I need to search a file for text "InstallDir=" + newline character and
> replace it with something like:  InstallDir=C\:\\mws71 + newline

>> "InstallDir=\n".gsub /(InstallDir=)(\n)/, '\1C\:\mws71\2'
=> "InstallDir=C\\:\\mws71\n"

> My own experimentation with this had problems with writing the back-
> slashes to the file (it's a requirement of the format to have the back-
> slashes as in my example).  The string had the back-slashes in it but
> they didn't get persisted to the file correctly.

In a single-quoted string, one backslash outputs one backslash.
In a double-quoted string, two backslashes outputs one backslash.

>> '\ '
=> "\\ "

>> "\\ "
=> "\\ "

> Are there any libraries that perform a search and replace?

String#gsub

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