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Consider the following minimal non-working example (comment the line with the \test{..} to compile. I'd like to have a \verb+something+ inside my \test{} environment. How can I achieve that?
\documentclass{article}
\usepackage{xcolor,fancyvrb}
\newcommand{\test}[1]{{\color{blue}#1}}
\usepackage{siunitx,booktabs}
\begin{document}
This works \verb+\num{6.022e-23}+
\test{This is a test of a \verb+verb+}
\end{document}
You could use cprotect, but you should think twice before using \verb when, perhaps,\texttt` might suffice.
\documentclass{article}
\usepackage{xcolor,cprotect}
\newcommand{\test}[1]{\textcolor{blue}{#1}}
\begin{document}
This works \verb+\num{6.022e-23}+
\cprotect\test{This is a test of a \verb+\num{6.022e-23}+}
\end{document}
If you have several appearances of \test containing \verb, you might want to make it automatically apply \cprotect:
\documentclass{article}
\usepackage{xcolor,cprotect}
\newcommand{\test}[1]{\textcolor{blue}{#1}}
\cMakeRobust\test
\begin{document}
This works \verb+\num{6.022e-23}+
\test{This is a test of a \verb+\num{6.022e-23}+}
\end{document}
\texttt{} could suffice, but it would make it a nightmare to write something code-ish in the macro...
– Holene
Apr 14 '16 at 20:29
As I commented, \verb can neither appear in a macro definition nor argument.
However, depending on your need, this may suffice. One saves a verbbox in advance, and can pass that as an argument.
\documentclass{article}
\usepackage{xcolor,verbatimbox}
\newcommand{\test}[1]{{\color{blue}#1}}
\usepackage{siunitx,booktabs}
\begin{document}
This works \verb+\num{6.022e-23}+
\begin{verbbox}verb\end{verbbox}%
\test{This is a test of a \theverbbox}
\end{document}
If one wanted the verb in blue, then the verbbox can be saved as {\color{blue}\begin{verbbox}verb\end{verbbox}}%.
\verbinside a macro definition, or as an argument to one. – Steven B. Segletes Apr 14 '16 at 20:04