Question

I have the following problem. I have defined a macro, func as follows


ewcommand{func}[1]{% do something with #1  
X #1 Y
}

I now want to define another macro


ewcommand{MyFunc}[1]{  
% parse #1 and if it contains "func{....}", ignore all except this part
% otherwise ignore #1 
}

Can someone tell me how to implement MyFunc?

Here is what should happen:

MyFunc{123abcdefg}              % should print nothing
MyFunc{123func{abcd}efg}       % should print X abcd Y

I can only change the code of MyFunc. func should remain as it is.

Answer 1

This can be done with standard LaTeX programming. Something like:

documentclass{article}

ewcommandfunc[1]{X #1 Y}
makeatletter

ewcommandMyFunc[1]{%
  in@{func}{#1}%
  ifin@
    ignore@all@but@func#1@nil
  fi
}
defignore@all@but@func#1func#2#3@nil{func{#2}}
makeatother
egin{document}
[MyFunc{123abcdefg}]              % should print nothing
[MyFunc{123func{abcd}efg}]       % should print X abcd Y
end{document}

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