Howsagoin (Bruno?),
I don't understand why the following regular expression replacement
gobbles the first two characters.
\tl_new:N \l_arg_tl
\regex_const:Nn \c_slash_regex_tl { / }
\tl_set:Nn \l_arg_tl {1234/5678/9012}
\regex_replace_all:NnN \c_slash_regex_tl {\c{textbackslash}} \l_arg_tl
\regex_use:N \l_arg_tl
It gives me 34\textbackslash5678\textbackslash9012.
Thanks in advance for your help.
Regards,
Marc van Dongen