From: Ashley Sheridan on
On Tue, 2010-07-27 at 09:30 +0200, Gary wrote:

> I know there are a number of possible ways of doing this, but I was just
> wondering if there is an accepted way of doing so which is better
> than others, performance wise. An idiom, if you like.

If you only need to find if a string contains the character and not its
position, then strstr() (or strchr(), but according to the manual they
are both the same) is the fastest route to go down. Using strpos() is
slower because it has to return the actual position of what you were
looking for, and a regex will be the slowest of all (and one would have
to question the sanity of someone using a regex to find a single
character in a string!)