src/main/java/com/github/fge/grappa/parsers/BaseParser.java
@DontLabel
    public Rule ignoreCase(final String string)
    {
        Objects.requireNonNull(string);
        return ignoreCase(string.toCharArray());
    }
@DontLabel
    public Rule ignoreCase(final String string)
    {
        Objects.requireNonNull(string);
        return ignoreCase(string.toCharArray());
    }
Match a string literal in a case insensitive manner

@param string the string to match
@return a rule