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I'm hoping there is a regex rule that can fulfill this (seemingly simple) need, which is basically this:
RewriteRule ^url with spaces\.htm$ /store/redesignedurl.php [L]
Can any of the mod rewrite gurus out there help?
Welcome to WebmasterWorld [webmasterworld.com]!
Escape the spaces with a preceding "\" just like the dot in "\.html" in your example.
If you want the search engines to transfer your PR/link pop to the new URLs, use [R=301,L] for your flags.
With those changes, the rule you have should work.
Ref: Introduction to mod_rewrite [webmasterworld.com]