On Wed, Dec 24, 2025 at 02:38:21PM +0000, Helge Kreutzmann wrote:
> Without further ado, the following was found:
> 
> Issue:    I<(isupper(c)\\ ||\\ islower(c))> → B<(isupper(>I<c>B<) || islower(>I<c>B<))>

This is expected.


Cheers,
Alex

> 
> "checks for an alphabetic character; in the standard B<\\[dq]C\\[dq]> locale, "
> "it is equivalent to I<(isupper(c)\\ ||\\ islower(c))>.  In some locales, "
> "there may be additional characters for which B<isalpha>()  is true\\"
> "[em]letters which are neither uppercase nor lowercase."

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<https://www.alejandro-colomar.es>