Method is

corpus/java/training/guava/base/CharMatcher.java:376–378

Returns a char matcher that matches only one specified character.

(final char match)

   * Returns a {@code char} matcher that matches only one specified character.
   */
  public static CharMatcher is(final char match) {
    return new Is(match);
  }

  /**
   * Returns a {@code char} matcher that matches any character except the one specified.