switch produce warnings if the STRING contains the "," or the "#"
character.
-Note that under use L<locale> qw() taints because the definition of
-whitespace is tainted. See L<perlsec> for more information about
-tainting and L<perllocale> for more information about locales.
-
=item s/PATTERN/REPLACEMENT/egimosx
Searches a string for a pattern, and if found, replaces that pattern