Method isIn

src/main/java/org/apache/commons/lang3/CharRange.java:171–173

Constructs a CharRange over a set of characters. If start and end are in the wrong order, they are reversed. Thus a-e is the same as e-a. @param start first character, inclusive, in this range. @param end last character, inclusive, in this range. @return the new Ch

(final char start, final char end)

     * @since 2.5
     */
    public static CharRange isIn(final char start, final char end) {
        return new CharRange(start, end, false);
    }

    /**
     * Constructs a negated {@link CharRange} over a single character.