如何编写仅在字符串包含某些字符和数字时才能激活的正则表达式？

Question

I'm trying to develop some problems that my instructor gave me, and one of those problems is asking me to check if the input string complies with the following rules:

1. That the string contains numbers from 2 to 9.
2. That the string contains the letters TJQKA.
3. If within the string there is any other letter outside the mentioned ones, then the String is invalid.

EX:

643TJAKQ = Ok

72MAJTQ = Not Okay

1246AKJQ = Not Okay

AKT432 = Ok

This obviously is a Regex problem, because if I try to filter by lists, arrays or something else, It's going to take too much time just validating this (And I writting the code). I tried with this reg exp ( /[2-9]|(T|J|Q|K|A)/g ) but is garbage.

Answer 1

the following regex works: ^[2-9TJQKA]+$

explanation:

^ : start

[2-9TJQKA] : define allowed values

+ : allow more than one character Strings

$ : end

Answer 2

您可以简单地定义允许的字符：

[2-9TJQKA]+

Answer 3

Boolean okayOrNot = someString.matches("[2-9TJQKA]+");

Answer 4

I would recommend the regex: \\b[2-9TJQKA]+\\b

2-9 -accept only numbers between 2 and 9

TJQKA -accept only these characters

\\b -only words with only these characters

regex101 also on free formatter