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Showing content from https://lists.gnu.org/archive/html/emacs-devel/2022-11/msg01270.html below:

Re: grep: RE error in ^*** ADVICE-ON-FAILURE-: repetition-operator opera

I just checked, it was not incorrect. POSIX says that in BREs the '*' is special, except wen used:
- in a bracket expression
- as the first character of an entire BRE (after an initial '^', if any)
- as the first character of a subexpression (after an initial '^', if any)

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