When an alternation contains multiple alternatives that consist of a single character, it can be rewritten as a character class. This should be preferred because it is more efficient and can even help prevent stack overflows when used inside a repetition (see rule S5998 ).

== Noncompliant Code Example

----
Pattern.compile("a|b|c"); // Noncompliant
----

== Compliant Solution

----
Pattern.compile("[abc]");
// or
Pattern.compile("[a-c]");
----