Hi pygments team!

Since the update to 2.20, the build of our documentation using Sphinx is generating warnings that were not here in 2.19.2.

The .rst snippet of code is as follow

.. code:: wl

   (* [command] *)

   gap = 7/4 + flagNLOSO*(L^2*(-15/32 - (45*\[Nu])/32))/r^2

and this raises the following warning:

WARNING: Lexing literal_block '(* [command] *)\n\ngap = 7/4 + flagNLOSO*(L^2*(-15/32 - (45*\\[Nu])/32))/r^2' as "wl" resulted in an error at token: '\\'. Retrying in relaxed mode. [misc.highlighting_failure]

The only location I am seeing a \\ is for \\[Nu] which comes from \[Nu] on the original input. The other package we are using is pygments-mathematica. I believe this comes from pygments as the failures started with the release date of 2.20, but I might be completely wrong, please let me know (using sphinx 9.0.4).

Thank you!