From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Abrahamsen <eric@ericabrahamsen.net>
Subject: Re: little elisp help?
Date: Wed, 02 Jul 2014 15:54:12 -0700
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tom <scrawler@gmail.com> writes:

> hi guys,
>
> I have this:
>
> (setq org-link-abbrev-alist
> '(("foo" . "file:/path/to/%(myfun).txt")))
>
> I'm trying to have "myfun" replace any spaces in the tag with
> underscores, but I'm not having much luck. Would someone mind giving
> me a hint?
>
> Thanks.

You might consider using the built-in `org-link-escape', it's likely to
do everything you need, and it's battle-tested!