best way to replace first word in string?

William Park opengeometry at
Sun Oct 23 01:53:19 CEST 2005

Chris F.A. Johnson <cfajohnson at> wrote:
> On 2005-10-22, William Park wrote:
> > hagai26 at <hagai26 at> wrote:
> >> I am looking for the best and efficient way to replace the first word
> >> in a str, like this:
> >> "aa to become" -> "/aa/ to become"
> >> I know I can use spilt and than join them
> >> but I can also use regular expressions
> >> and I sure there is a lot ways, but I need realy efficient one
> >
> > I doubt you'll find faster than Sed.
>    On the contrary; to change a string, almost anything will be faster
>    than sed (except another external program).
>    If you are in a POSIX shell, parameter expansion will be a lot
>    faster.
>    In a python program, one of the solutions already posted will be
>    much faster.

Care to put a wager on your claim?

William Park <opengeometry at>, Toronto, Canada
ThinFlash: Linux thin-client on USB key (flash) drive
BashDiff: Super Bash shell

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