[luatex] Library for regular expressions in lualatex

[Reinhard Kotucha]

On 2019-06-11 at 04:17:15 +0300, Саша Козловский wrote:

 > Hello Henri. Maybe you right,and regexp is not good way. May be exists 
 > ways to redefine $$ and $ in lualatex,because i want,that for formulas 
 > with $$ and $ inserted actualtext,so i decided use lua callbacks,to 
 > replace it in [] or (),because in this redefined commands i do insertion 
 > of actualtext in formula. May be you know another ways,how insert 
 > actualtext in formulas with $$ or $ (actualtext must contains tex 
 > notation of this formula)? Thanks very mutch everybody for the any help 
 > and any ideas.

Why do you need LuaTeX callbacks at all?  Why don't you simply fix the
source files?

As Henri pointed out, regular expressions are quite problematic in
some cases.  Emacs provides a function to apply regexps
semi-automatically (query-replace-regexp).  You can skip problematic
things and solve them later.  For a fully automatic approach
Emacs-Lisp is also a good choice.  The ability to search backwards
makes things easier.

BTW, AFAIK there is no need to convert single $ signs to \( and \) in
LaTeX.  The $$ were always wrong, hence it makes more sense to fix
them in the source files instead of using LuaTeX callbacks.

Regards,
  Reinhard

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