(prev, current) => prev.replace(current[0], current[1].bind(pattern)),
            pattern
        )
        regexCache[pattern] = source
    }

    return ignoreCase
        ? new RegExp(source, 'i')
        : new RegExp(source)
}

const isString = subject => typeof subject === 'string'

// > A blank line matches no files, so it can serve as a separator for readability.