[TUHS] BRE Grouping in Sed?

[Chet Ramey via TUHS]

On 5/21/26 5:01 PM, segaloco via TUHS wrote:

> For the record, in GNU sed this warning is triggered, when POSIXLY_CORRECT, under any s command where an escaped character other than '&', '\\', '[0-9]', '\n', or the separator character ('/' default) is found.  Testing this, it'll also balk at, for instance, '\?'.

The standard does say:

"The meaning of an unescaped <backslash> immediately followed by any
character other than '&', <backslash>, a digit, <newline>, or the delimiter
character used for this command, is unspecified."

but I think they're referring to the replacement string, not the pattern.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
		 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet at case.edu    http://tiswww.cwru.edu/~chet/
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