\verb work within...?The LaTeX verbatim commands work by changing category codes.  Knuth
says of this sort of thing "Some care is needed to get the timing
right...", since once the category code has been assigned to a
character, it doesn't change.  So \verb has to assume that it is
getting the first look at its parameter text; if it isn't, TeX has
already assigned category codes so that \verb doesn't have a
chance.  For example:
    \verb+\error+
will work (typesetting '\error'), but
    \newcommand{\unbrace}[1]{#1}
    \unbrace{\verb+\error+}
will not (it will attempt to execute \error).  Other errors one
may encounter are '\verb ended by end of line', or even '\verb
illegal in command argument'.
This is why the LaTeX book insists that verbatim
commands must not appear in the argument of any other command; they
aren't just fragile, they're quite unusable in any command parameter,
regardless of
\protection.
The first question to ask yourself is: "is \verb actually
necessary?".
\texttt{your text} produces the same result
  as \verb+your text+, then there's no need of
  \verb in the first place.
\verb to typeset a URL or email
  address or the like, then the \url command from the
  url package will help: it doesn't suffer from the problems
  of \verb.
\verb into the argument of a boxing
  command (such as \fbox), consider using the lrbox
  environment:
  \newsavebox{\mybox}
  ...
  \begin{lrbox}{\mybox}
    \verb!VerbatimStuff!
  \end{lrbox}
  \fbox{\usebox{\mybox}}
Otherwise, there are three partial solutions to the problem.
\VerbatimFootnotes, which redefines the \footnotetext (and
  hence the \footnote) commands in such a way that you can include
  \verb commands in its argument.  This approach could in
  principle be extended to the arguments of other commands, but it can
  clash with other packages: for example, \VerbatimFootnotes
  interacts poorly with the para option to the footmisc
  package.
\SaveVerb,
  with a corresponding \UseVerb command, that allow you to save
  and then to reuse the content of its argument; for details of this
  extremely powerful facility, see the package documentation.
Rather simpler is the verbdef package, which defines a (robust) command which expands to the verbatim argument given.
\texttt), consider using
  \string.  my\string_name\verb+my_name+, and will work in the argument of a command.  It
  won't, however, work in a moving argument, and no amount of
  
  \protection will make it work in
  such a case.
This question on the Web: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=verbwithin