These functions all manipulate strings in various
ways. Some more specialized sections can be found in
the regular expression and URL
handling sections.
For information on how strings behave, especially
with regard to usage of single quotes, double quotes,
and escape sequences, see the Strings entry in the
Types section of the
manual.
For even more powerful string handling and
manipulating functions take a look at the POSIX regular expression functions
and the Perl compatible regular
expression functions.