*repeats the group contents below any number of times:
\s*?any whitespace character, repeated any number of times
\+the literal + (4310 / 538 / 2B16)
-the literal - (4510 / 558 / 2D16)
\*the literal * (4210 / 528 / 2A16)
\/the literal / (4710 / 578 / 2F16)
\s*any whitespace character, repeated any number of times
\d+a digit, repeated at least once