Java Regex include all letters of the alphabet except certain letters

问题

What I need to do is to determine whether a word consists of letters except certain letters. For example I need to test whether a word consists of the letters from the English alphabet except letters: I, V and X.

Currently I have this long regex for the simple task above:

Pattern pattern = Pattern.compile("[ABCDEFGHJKLMNOPQRSTUWYZ]+");

Any of you know any shorthand way of excluding certain letters from a Java regex? Thanks.

回答1:

You can use the && operator to create a compound character class using subtraction:

String regex = "[A-Z&&[^IVX]]+";

回答2:

You could simply specify character ranges inside your character class:

[A-HJ-UWYZ]+

回答3:

Just use a negative lookahead in your pattern.

Pattern pattern = Pattern.compile("^(?:(?![IVX])[A-Z])+$");

DEMO

回答4:

Use [A-Z&&[^IVX]]+ to exclude certain characters from the A-Z range - see Pattern

来源：https://stackoverflow.com/questions/25608925/java-regex-include-all-letters-of-the-alphabet-except-certain-letters