The theme and plugin editor is an abomination, related to times when people where ignoring any security common sense in order to pretend to be user friendly, and if you have to use them then you are doing something terribly wrong.
If you can use the editor then your small problem is not being able to use slashes, your bigger one is that your security (in this case file permissions) sucks.
In addition it is just an horrible tool to edit files so just don’t use it.
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