newcommand with \href

Question

I'm having trouble using newcommand with the \href

I would like a newcommand like this:

\newcommand\link[2]{\href{#1}{\underline{#2}}}

This command works fine quite all, for exemple:

\link{htt://www.impa.br}{IMPA}

But it does not work when the URL name has code like #1. For example, it does not work in this exemple:

\link{http://matematica.obmep.org.br/index.php/modulo/index#1}{modules}

It does not work because the #1 in the URL name is used with the #1 in the newcommand.

How could I solve this problem?

Thank you for your answer. I believe this is not a duplicate topic. But may be I did not understand your suggestion. In my case, there are websides that have in your URL codes as # 1, for example:
[http://matematica.obmep.org.br/index.php/modulo/index#1]

And there are websites with simpler URL, for example:

[http://www.impa.br]

In all of my cases, I wish that the URL is send to the newcommand as a string. — Francisco Dutenhefner, Oct 24 '14 at 16:19
Excuse me. Unfortunately I did not understand your suggestion. Could you explain how it would look all the code so that I can pass any URL address for the newcommand? Thank you. — Francisco Dutenhefner, Oct 25 '14 at 12:52

score 4 · Answer 1 · edited Apr 13 '17 at 12:35

Really this is a duplicate of Problem with use of '#' in custom \href command. But just to make it clear how to use this in your case here is a complete example:

\documentclass{article}

\usepackage{hyperref}

\makeatletter
\newcommand*{\link}{\begingroup\@makeother\#\@mylink}
\newcommand*{\@mylink}[2]{\href{#1}{\underline{#2}}\endgroup} 
\makeatother

\begin{document}

\link{htt://www.impa.br}{IMPA} 

\link{http://matematica.obmep.org.br/index.php/modulo/index#1}{modules}

\end{document}

As in the other question, one defines a helper command which is called with # given an appropriate category code so it is no longer interpreted as a command argument.

newcommand with \href

1 Answers1