(I've fixed up your post, but have a look at Formatting tips specific to the Opus forum for how to use code blocks around regex to prevent the forum mangling the codes. Also useful for paths containing backslashes, and so on.)
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The
#on the end of each regex is an Opus-specific extension which means they are applied repeatedly until the string stops changing.Both regex only modify one backslash or pipe character at a time, before being run again.
If there was just one regex to turn
\into\\then it would keep adding another backslash after the very first (or last) one in the string, never finish, and never get to any of the other backslashes.(Opus will eventually stop the loop if it goes on too long or the string gets too long, to prevent a situation like that taking forever or crashing the program. But the result still wouldn't be what you wanted.)
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The easiest way to get that is to reset your toolbars to the factory defaults and then compare them to your old toolbars. You can then drag anything you want from the default toolbars to your personal ones.
Rename your personal toolbars first, of course! Don't reset them in-place or you'll lose your edits.
If you then use your renamed versions as your main toolbars, it's then easy to flip on the default toolbars, and reset them if needed, to compare them again later on. This is what I do. I never use the actual default toolbars, except to check what's on them.
Settings > Toolbars > Set as Default Toolbar Set can be used to make your current toolbars the ones that windows will use by default (unless they override it). You can also save toolbar sets from the same menu.