Re: Backslashes in regular expression replacement patterns

[John W. Eaton]

On 17-Oct-2012, Rik wrote:

| With an expression like "\$1" the
| interpreter itself does one round of escape sequence processing and changes
| this to "$1".  So when I get the replacement string in regexprep I already
| can't tell whether the user typed "\$1" or "$1".

I don't see that this matters.  For example, if to pass the two
character sequence \t to regexp with a double quoted string, you have
to write it as "\\t".  The only question I see is whether we should be
converting unrecognized \X sequences in double quoted strings to X.

jwe