I am working on an application, in which input strings must have following properties:
- Contains at least 4 unique characters
- Doesn't contain non-printable ASCII characters
- Doesn't contain comma (,), colon (:), equals sign (=), or space
I came up with below regex, which matches strings with at least 4 unique chars, and all printable ASCII chars excluding space.
^([!-~] )((?!\1)[!-~] )((?!\1|\2)[!-~] )((?!\1|\2|\3)[!-~] )$
How do I modify it to exclude comma (,), colon (:), equals sign (=)?
CodePudding user response：
In Java you can make use of Character Class Subtraction.
The range can look like [!-~&&[^,:=]]
^([!-~&&[^,:=]] )((?!\1)[!-~&&[^,:=]] )((?!\1|\2)[!-~&&[^,:=]] )((?!\1|\2|\3)[!-~&&[^,:=]] )$
In Java:
String regex = "^([!-~&&[^,:=]] )((?!\\1)[!-~&&[^,:=]] )((?!\\1|\\2)[!-~&&[^,:=]] )((?!\\1|\\2|\\3)[!-~&&[^,:=]] )$";