Subject: Re: Repalcement for grep(1)
To: Todd Vierling , Jamie Howard <>
From: Hannah Schroeter <>
List: tech-userlevel
Date: 07/05/1999 11:47:54

On Sat, Jul 03, 1999 at 05:00:41PM -0400, Todd Vierling wrote:
> [...]

> Hm.  Adding ^ and $ should work, provided you don't specify either
> REG_NOTBOL or REG_NOTEOL.  (I assume that (foo) above, including the parens,
> is the RE.  With the parens, it depends whether you're using standard REs or
> extended REs.  :)

But be careful about adding ^ and $ to something like (extended syntax)
foo|bar. ^foo|bar$ is wrong, and ^(foo|bar)$ works HERE but not always,
as when the original regex uses \number backreferences, you must patch them
(increase by one), and you're hosed if \9 is already used.

> [...]

Regards, Hannah.