How can you escape underscores only in the tabular environment without the use of \_?
This thread discusses about underscore in general. I cannot use the environment verbatim nor the package underscore.
Sample data
\begin{tabular}{| l | l | p{5cm} |}
\hline
delete_a_question.php&poistaa kysymyksen&setterit \\ \hline
edit_question.php&muokkaa kysymyst\"{a}&getterit, HTML koodin generointia \\ \hline
--cut--
\end{tabular}
Rather than hacking with catcodes manually, the underscore package does it for you so that _ works in text as a printed underscore, while still behaving as a subscript modifier in maths mode. Just load the package.
\bgroup
\catcode`\_=13%
\def_{\textunderscore}%
\begin{tabular}{|l|l|p{4.5cm}}
test_444 & 555 & 4_4\\\hline
\end{tabular}
\egroup
And now for some normal maths: $a_i=3$.
Here, I change the category code of the underscore character so that it is active (this means that I can give the underscore a macro definition). I define the underscore character to output an actual underscore character.
The \bgroup and \egroup limit the effects of redefining the underscore character.
