Mathematica also has its own string pattern sytax http://reference.wolfram.com/language/ref/StringExpression.html http://reference.wolfram.com/language/ref/Str

Mathematica also has its own string pattern sytax http://reference.wolfram.com/language/ref/StringExpression.html http://reference.wolfram.com/language/ref/StringExpression.h... Something like that would be StringExpression[ "$", Repeated[DigitCharacter], ".", DigitCharacter, DigitCharacter ] or StringExpression[ "$", Repeated[DigitCharacter], ".", Repeated[DigitCharacter, {2}], ] or StringExpression[ "$", NumberString ] and the other is StringExpression[ Repeated[ StringExpression[ Repeated["p", {1, Infinity}], Repeated["q", {2, Infinity}] ], {2} ] ] This can be made more concise since StringExpression has an infix form (~~) and Repeated can sometimes be replaced by postfix ..