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.
\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}).
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.
Use \nolinebreak
\nolinebreak[number]
The \nolinebreak command prevents LaTeX from breaking the current line at the point of the command. With the optional argument, number, you can convert the \nolinebreak command from a demand to a request. The number must be a number from 0 to 4. The higher the number, the more insistent the request is.
Source: http://www.personal.ceu.hu/tex/breaking.htm#nolinebreak
