>>> "ESF" == Eric S Fraga <e.fr...@ucl.ac.uk> writes:
> On Friday, 31 Dec 2021 at 14:21, Uwe Brauer wrote:
>> ⚠️ Caution: External sender
>>
>>
>> Hi
>>
>> Does anybody know about a function that would convert between
>> date format like 31.12.2021 to <2020-12-31> and back?
> This is Emacs, of course, so you could use query-replace-regexp (M-%)
> with, for instance
> \([0-9][0-9]\)\.\([0-9][0-9]\)\.\([0-9]\{4\}\)
> as the pattern to search for and
> <\3-\2-\1>
> as the replacement. The converse is left as an exercise for the
> reader. ;-)
Thanks the \{4\} surprise me. I tried
(query-replace-regexp "\\(\\<[0-9]*\\)\\([\\.]\\)\\([0-9]*\\>\\)" "\\3\\2\\1")
And that did not work.
Uwe
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