The first call to the replace method is what puzzles me, I don't understand where the "$1" value comes from or what it means. I would think that the call should replace the found pattern with "".
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The string.replace() is deprecated on python 3.x. What is the new way of doing this?
483 I use the .replace function to replace multiple strings: ... although that feels like bad syntax what is the proper way? like how in grep/regex you can do \1 and \2 to replace fields to certain search strings
160 If you want to replace multiple characters you can call the String.prototype.replace() with the replacement argument being a function that gets called for each match. All you need is an object representing the character mapping that you will use in that function.
This is done to avoid the inherent confusion between the lack of a global flag (which implies "do NOT replace all") and the name of the method being called (which strongly suggests "replace all"). Notably, String.prototype.replaceAll behaves just like String.prototype.replace if searchValue is a global regular expression.
How do I replace all occurrences of a string? - Stack Overflow