May I also suggest replacing \n with \1...\9? Maybe that way it is easier to visually identify if you're looking for it, and less ambiguous (a literal \n means newline, and maybe someone reading the docs quickly just ignores that entry because they assume it's talking about the newline).

(And maybe it is a good idea to add a note in the documentation highlighting that & and $1...$9 don't work as they do in other regex "dialects" such as Perl; it's \0 and \1...\9 here. After all, the documentation does claim that "the syntax is Perl compatible", so one might assume this also applies to substitution patterns.)

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