+matches at least one character from the set below:
0-9one character from 0 (4810) to 9 (5710)
\s+any whitespace character, repeated at least once
okthe literal text ok (case sensitive) \s+any whitespace character, repeated at least once
+matches at least one character from the set below:
0-9one character from 0 (4810) to 9 (5710)
\s+any whitespace character, repeated at least once
nokthe literal text nok (case sensitive)