\d*a digit, repeated any number of times
\.the literal . (4610 / 568 / 2E16)
\d*a digit, repeated any number of times
Negated Character Class[^[:space:]+\t] [:space:]a whitespace character, including a line break [ \t\r\n\v\f]
+the literal + (4310 / 538 / 2B16)
\ta tab character (ASCII 9)