This is identical to the C function, except that it can apply to a single
character or to a whole string. Consider using regular expressions and the
-C</[[:isalnum:]]/> construct instead, or possibly the C</\w/> construct.
+C</[[:alnum:]]/> construct instead, or possibly the C</\w/> construct.
=item isalpha
This is identical to the C function, except that it can apply to a single
character or to a whole string. Consider using regular expressions and the
-C</[[:isalpha:]]/> construct instead.
+C</[[:alpha:]]/> construct instead.
=item isatty
This is identical to the C function, except that it can apply to a single
character or to a whole string. Consider using regular expressions and the
-C</[[:iscntrl:]]/> construct instead.
+C</[[:cntrl:]]/> construct instead.
=item isdigit
This is identical to the C function, except that it can apply to a single
character or to a whole string. Consider using regular expressions and the
-C</[[:isdigit:]]/> construct instead, or the C</\d/> construct.
+C</[[:digit:]]/> construct instead, or the C</\d/> construct.
=item isgraph
This is identical to the C function, except that it can apply to a single
character or to a whole string. Consider using regular expressions and the
-C</[[:isgraph:]]/> construct instead.
+C</[[:graph:]]/> construct instead.
=item islower
This is identical to the C function, except that it can apply to a single
character or to a whole string. Consider using regular expressions and the
-C</[[:islower:]]/> construct instead. Do B<not> use C</a-z/>.
+C</[[:lower:]]/> construct instead. Do B<not> use C</a-z/>.
=item isprint
This is identical to the C function, except that it can apply to a single
character or to a whole string. Consider using regular expressions and the
-C</[[:isprint:]]/> construct instead.
+C</[[:print:]]/> construct instead.
=item ispunct
This is identical to the C function, except that it can apply to a single
character or to a whole string. Consider using regular expressions and the
-C</[[:ispunct:]]/> construct instead.
+C</[[:punct:]]/> construct instead.
=item isspace
This is identical to the C function, except that it can apply to a single
character or to a whole string. Consider using regular expressions and the
-C</[[:isspace:]]/> construct instead, or the C</\s/> construct.
+C</[[:space:]]/> construct instead, or the C</\s/> construct.
=item isupper
This is identical to the C function, except that it can apply to a single
character or to a whole string. Consider using regular expressions and the
-C</[[:isupper:]]/> construct instead. Do B<not> use C</A-Z/>.
+C</[[:upper:]]/> construct instead. Do B<not> use C</A-Z/>.
=item isxdigit
This is identical to the C function, except that it can apply to a single
character or to a whole string. Consider using regular expressions and the
-C</[[:isxdigit:]]/> construct instead, or simply C</[0-9a-f]/i>.
+C</[[:xdigit:]]/> construct instead, or simply C</[0-9a-f]/i>.
=item kill