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

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