In Jquery AND Rails, how to get visible character count of a string?

Let's say you have a string with embedded links and tags like so: This string has some links inside it. Then the visible string to a user is: This string has some links inside it. The full string has 73 characters and the visible just 37 characters. What I would like is to be able to both in jQuery and in Rails get character counts for strings counting just visible characters. (jQuery such that I could give a live character count in an input field, and Rails for validations and truncation purposes). Anyone know anything that could help? Surely there is some way of doing this..

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