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ruby - Extract text before first comma with regex

I want to extract text before first comma (first and last name) from strings like:

John Smith, RN, BSN, MS
Thom Nev, MD
Foo Bar, MD,RN

I tried with regex:

(.*)s(.*),s

but this doesn't work for all situations. How to achieve this?

question from:https://stackoverflow.com/questions/12148784/extract-text-before-first-comma-with-regex

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Match everything from the beginning of the string until the first comma:

^(.+?),

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