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The tests here dont cover a lot of overinclusion mistakes you could make with regex here. for instance, this regex will pass all tests:
/^[MDE][rs]{1,2}\.[a-zA-Z]*$/
but this would also match "Ess", "Err", "Msr", Mss", "Mrr", etc. as well as the legitimate prefixes. A better pattern could be something like:
/^(Mr?s|[MDE]r)\.[a-zA-Z]*$/
you could also or together each possible prefix, which would be less performant but more readable, which could be preferrable if optimization isn't needed.
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Day 7: Regular Expressions II
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The tests here dont cover a lot of overinclusion mistakes you could make with regex here. for instance, this regex will pass all tests:
/^[MDE][rs]{1,2}\.[a-zA-Z]*$/but this would also match "Ess", "Err", "Msr", Mss", "Mrr", etc. as well as the legitimate prefixes. A better pattern could be something like:/^(Mr?s|[MDE]r)\.[a-zA-Z]*$/you could also or together each possible prefix, which would be less performant but more readable, which could be preferrable if optimization isn't needed.