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One regex gotcha:
* “.” means any character except newline, and w is alphanumeric+underscore – so if your source src attribute was “my-cat.mp4”, then the first line that sets the src attribute would end up putting in “bumper-in.cat”. If you don’t know what your filenames will be apart from the extension, plus you only care about the extension, probably better just to use something like /.(w+)$/
And a couple of regex typos:
* The “w” character classes all appear to be missing their “”, unless you only want to match wwwww.www ;)
* The last regex has “([w]+)” which also should presumably be w+
Hope that’s helpful.