Calibre search & replace

Question

I would like to replace <space><letter><space> with <space><letter>&nbsp;.

I'we try to replace ([aiowz]) with  $1 but in calibre it wouldn't work... it would put $1 into text.

What should i put into replace field?

Answer 1

In Calibre's Find/Replace window, \1 instead of $1 in the Replace box works well. Just don't forget to set Mode to Regex.