code: public static boolean containsContentEqualsIgnoreCase(Collection<CharSequence> collection, CharSequence value) {
          for (CharSequence v : collection) {
              if (contentEqualsIgnoreCase(value, v)) {
                  return true;
              }
          }
          return false;
      }
docs: Determine if {@code collection} contains {@code value} and using
  {@link #contentEqualsIgnoreCase(CharSequence, CharSequence)} to compare values.
  @param collection The collection to look for and equivalent element as {@code value}.
  @param value The value to look for in {@code collection}.
  @return {@code true} if {@code collection} contains {@code value} according to
  {@link #contentEqualsIgnoreCase(CharSequence, CharSequence)}. {@code false} otherwise.
  @see #contentEqualsIgnoreCase(CharSequence, CharSequence)