Regular Expressions 101

1) Usernames can only use alpha-numeric characters. 2) The only numbers in the username have to be at the end. There can be zero or more of them at the end. Username cannot start with the number. 3) Username letters can be lowercase and uppercase. ...

驗證資料夾路徑

Map operator, constants, number of dice, number of faces, exploding/imploding and selective dice notations