![]() One of the things that make regexes hard to read for beginners is that many points of syntax that serve vastly different purposes all start with the same two characters: The heroes who expanded regular expressions (such as Henry Spencer and Larry Wall) followed in these footsteps. ![]() Maybe they were into hieroglyphs, maybe they were into cryptography, or maybe that was just the way you did things when you only had a few kilobytes or RAM. Stephen Kleene and Ken Thompson, who started them, obviously wanted something very compact. I don't know the fine details of the history of regular expressions. I thought I would bring them all together in one place. ![]() A question mark inside a parenthesis: So many uses!
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