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jfbu/gist:451cd23300f48f06593ce288b2889d21

Last active September 8, 2018 20:15
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CheckWetherBrace
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gistfile1.txt
\catcode`@ 11
\long\def\@gobble#1{}
%\long\def\JFB@stop@firstoftwo#1#2{\z@#1}
\long\def\JFB@stop@secondoftwo#1#2{\z@#2}
\long\def\JFB@stop@thirdoffour#1#2#3#4{\z@#3}
\long\def\JFB@CheckWhetherBrace#1{%
\romannumeral
\expandafter\@gobble\expandafter
{\expandafter{\string#1.}\expandafter\JFB@stop@thirdoffour\string}%
\JFB@stop@secondoftwo
}%
\JFB@CheckWhetherBrace{cccc{aaaa}bbbb}{YES}{NO}
\JFB@CheckWhetherBrace{{aaaa}bbbb}{YES}{NO}
\bye
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