\d*a digit, repeated any number of times
\.the literal . (4610 / 568 / 2E16)
*the literal (3210 / 408 / 2016) , repeated any number of times
.*any character (except for line terminators), repeated any number of times
:the literal : (5810 / 728 / 3A16)
U modifier: Ungreedy. Quantifiers are lazy by default. A trailing ? makes a quantifier greedy