How can I prevent LaTeX from inserting linebreaks in my \texttt{...} or \url{...} text regions? There's no spaces inside I can replace with ~, it's just breaking on symbols.
Update: I don't want to cause line overflows, I'd just rather LaTeX insert linebreaks before these regions rather than inside them.
Also, if you have two subsequent words in regular text and you want to avoid a line break between them, you can use the ~ character.
For example:
As we can see in Fig.~\ref{BlaBla}, there is nothing interesting to see. A~better place..
This can ensure that you don't have a line starting with a figure number (without the Fig. part) or with an uppercase A.
\mbox is the simplest answer. Regarding the update:
TeX prefers overlong lines to adding too much space between words on a line; I think the idea is that you will notice the lines that extend into the margin (and the black boxes it inserts after such lines), and will have a chance to revise the contents, whereas if there was too much space, you might not notice it.
Use \sloppy or \begin{sloppypar}...\end{sloppypar} to adjust this behavior, at least a little. Another possibility is \raggedright (or \begin{raggedright}...\end{raggedright}).
Define myurl command:
\def\myurl{\hfil\penalty 100 \hfilneg \hbox}
I don't want to cause line overflows,
I'd just rather LaTeX insert linebreaks before
\myurl{\tt http://stackoverflow.com/questions/1012799/}
regions rather than inside them.