Latex - extract substring/ignore characters
I have the following problem. I have defined a macro, \func
as follows
\newcommand{\func}[1]{% do something with #1
X #1 Y
}
I now want to define another macro
\newcommand{\MyFunc}[1]{
% parse #1 and if it contains "\func{....}", ignore all except this part
% otherwise ignore #1
}
Can someone tell me how to implement \MyFu开发者_如何学Gonc
?
Here is what should happen:
\MyFunc{123abcdefg} % should print nothing
\MyFunc{123\func{abcd}efg} % should print X abcd Y
I can only change the code of \MyFunc
. \func
should remain as it is.
This can be done with standard LaTeX programming. Something like:
\documentclass{article} \newcommand\func[1]{X #1 Y} \makeatletter \newcommand\MyFunc[1]{% \in@{\func}{#1}% \ifin@ \ignore@all@but@func#1\@nil \fi } \def\ignore@all@but@func#1\func#2#3\@nil{\func{#2}} \makeatother \begin{document} [\MyFunc{123abcdefg}] % should print nothing [\MyFunc{123\func{abcd}efg}] % should print X abcd Y \end{document}
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