#1 texdef on MacOS 12.3 consistently throws error/warning

[Alan Munn]

Hi Martin, after updating my Mac to MacOS 12.3, and TL 2022 I now consistently get an error/warning when running texdef:

I don't know if this is related to some change in the perl that ships with the MacOS, but I suspect it might be.

The perl version is:

This is perl 5, version 30, subversion 3 (v5.30.3)

Here's what happens with every invocation of latexdef:

alan$ latexdef \underline
Unescaped left brace in regex is passed through in regex; marked by <-- HERE in m/^\\\@protected\@testopt { <-- HERE ?\\.*? }? *(\\\\.*?) / at /usr/local/bin/latexdef line 391.
Unescaped left brace in regex is passed through in regex; marked by <-- HERE in m/^\\\@testopt { <-- HERE ?(\\.*?) }?/ at /usr/local/bin/latexdef line 394.

\underline:
macro:->\protect \underline  


\underline :
\long macro:#1->\relax \ifmmode \@@underline {#1}\else $\@@underline {\hbox {#1}}\m@th $\relax \fi