intentionality - clear
Why is this an issue?Character classes in regular expressions are a convenient way to match one of several possible characters by listing the allowed characters or ranges of characters. If a character class contains only one character, the effect is the same as just writing the character without a character class.
Thus, having only one character in a character class is usually a simple oversight that remained after removing other characters of the class.
Noncompliant code example"a[b]c" "[\\^]"Compliant solution
"abc" "\\^" "a[*]c" // Compliant, see ExceptionsExceptions
This rule does not raise when the character inside the class is a metacharacter. This notation is sometimes used to avoid escaping (e.g., [.]{3} to match three dots).
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