Comments by "HalfSourLizard" (@halfsourlizard9319) on "Defining Regular Expressions (RegEx) - Computerphile" video.

  1. It's maths notation; in most implementations a pipe (or an escaped pipe) is used.
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  2.  @helleye311  And, of course, in most implementation, + is used for >0 repetition, rather than disjunction/alternative.
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  3. s/implementation/implementations/
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  4. I'm not a fan of set theory, either ;}
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