src/main/java/com/github/fge/grappa/parsers/BaseParser.java
@Cached
    @DontLabel
    public Rule string(final char... characters)
    {
        if (characters.length == 1)
            return ch(characters[0]); // optimize one-char strings
        return new StringMatcher(new String(characters));
    }
@Cached
    @DontLabel
    public Rule string(final char... characters)
    {
        if (characters.length == 1)
            return ch(characters[0]); // optimize one-char strings
        return new StringMatcher(new String(characters));
    }
Match a given set of characters as a string literal

@param characters the characters of the string to match
@return a rule