[New pcre2 version] Sebastian Hudak: /* Consistent escaping rules */ clarified "basic" POSIX regex. also removed all of the empty lines separating things in the article

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Consistent escaping rules: clarified "basic" POSIX regex. also removed all of the empty lines separating things in the article

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https://en.wikipedia.org/w/index.php?title=Perl_Compatible_Regular_Expressions&diff=996675467&oldid=prev