Mass conversion of specific items

[Sharon Kimble <boudiccas@skimble.plus.com>]

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I'm hoping that someone can help with this problem I have.

I have several org-mode files which have some specific formatting in
individual items, specifically -

- --8<---------------cut here---------------start------------->8---
\uuline{foo}
- --8<---------------cut here---------------end--------------->8---

This gives a double-underling of 'foo' when exported to latex and built
into a pdf file.

I'm now in the situation when the double underlining also needs to be
italicised, and in org-mode its showing as -

- --8<---------------cut here---------------start------------->8---
/\uuline{foo}/
- --8<---------------cut here---------------end--------------->8---
  
This gives a double-underling and italicised of 'foo' when exported to
latex and built into a pdf file.

I would like to change about 150+ 'foos' and possibly using
'replace-string' to do it. Also, 'foo' is lots of different words which
includes spaces between some of them. So how can I do it please?

Thanks  
  Sharon.
- -- 
Debian 10.5, fluxbox 1.3.7, emacs 27.1, org 9.3.7
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