tjcrowder

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for...in


Reworded the opening sentence, the old one could be read as ignoring properties whose *values* are symbols (as this person did: https://stackoverflow.com/q/59436388/157247)

String length


Clarify that it's an instance data property and that String.length is completely unrelated.

Regular expressions


remove extraneous line breaks

Regular expressions


Further improve escaping

Regular expressions


beef up escaping, highlight that in a literal you need to escape slash