I really need to practice my regular expression skill set which part of the codecademy website can I do that? thanks 
It’s part of the “Data Wrangling & Tidying” portion of the data science path. I think it’s also in a few data analyst courses. I’m not sure what other courses share that content. Maybe computer science or front end engineering(?)
Your best bet would be to take a look at some syllabuses in the CC catalog.
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There’s the one lesson course introduction-to-regular-expressions which can also be taken as part of the Learn PHP skill path, I think.
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I encounter regex at php