\verb with % in tabularx

Question

Is there any way of typesetting the % symbol in \verb within a tabularx-cell?

\documentclass[]{article}
\usepackage[utf8]{inputenc}
\usepackage{tabularx}
\begin{document}

    \verb|b%a|

    \begin{tabular}{l l}
        \verb|b%a| & a
    \end{tabular}

    \begin{tabularx}{\linewidth}{l X}
        \verb|b%a| & a \\
    \end{tabularx}

\end{document}

In tabularx the body of the environment is already read and therefore tokenised. The category code changes of \verb can't be applied inside of it. Therefore, you'd have to change the catcode of % before the \begin{tabularx}, this means that you can't put comments there, too. You could do so by putting \begingroup\catcode\%=12prior to the\begin{tabularx}and\endgroupafter\end{tabularx}`. — Skillmon, Jul 08 '19 at 15:50
Footnote on page 2 of the manual for tabularx: Since Version 1.02, \verb and \verb* may be used, but they may treat spaces incorrectly, and the argument can not contain an unmatched { or }, or a % character. — egreg, Jul 08 '19 at 16:01
I opted for \verb to avoid the need of escaping all those %s etc. in the code code extracts that I was pasting, but you're right of course, I did end up using \ţexttt then. — Bastian, Jul 18 '19 at 16:28
@egreg you're right of course, I should have checked the manual first — Bastian, Jul 18 '19 at 16:29

score 1 · Accepted Answer · answered Jul 09 '19 at 07:30

Turning my comment into an answer: If you don't need comments inside of the body of tabularx you can turn the % char into a character which can be input directly. If you need comments you can turn another character which you don't need there into the comment char with

\category`\<char>=14

Just replace <char> with a single character which should be the comment character. In the example below I used # for the comments inside of tabularx:

\documentclass[]{article}
\usepackage[utf8]{inputenc}
\usepackage{tabularx}
\begin{document}

    \verb|b%a|

    \begin{tabular}{l l}
        \verb|b%a| & a
    \end{tabular}

    \begingroup
    % use `%' as a normal character and `#` as comment character
    \catcode`\#=14
    \catcode`\%=12
    \begin{tabularx}{\linewidth}{l X}
        \verb|b%a| & a \\ # this is a comment
    \end{tabularx}
    # \endgroup ends the scope of our category changes, so afterwards `#' is
    # again the parameter character and `%' the comments character
    \endgroup

\end{document}

\verb with % in tabularx

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