Regex get all before first occurrence of character - Stack Overflow

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What are regular expressions, and why should you use them? - Discover Better Value Faster

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Tutorial: Python Regex (Regular Expressions) for Data Scientists

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regex - How to extract a portion between the first and second occurrence of a character using regular expressions in R? - Stack Overflow

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Regex expressions cause stack overflows in MSVC 2015 · Issue #49 · docopt/docopt.cpp · GitHub

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