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    For all: The regular expression in the question was removed in revision 10, in 2015 (about 7 years later). Commented Feb 13, 2022 at 16:25
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    Strikeout shouldn't be necessary. That is what the revision history is for. If something is no longer valid, it should be removed. The answer should be as if it was written today. Commented Feb 13, 2022 at 16:27