"Impossible" to read? No. I didn't find it difficult to read at all. There are even comments that tell what the code is supposed to do, and tests that show how

"Impossible" to read? No. I didn't find it difficult to read at all. There are even comments that tell what the code is supposed to do, and tests that show how to use the functions. Are regular expressions "impossible" to read? Well maybe if someone doesn't understand regular expressions. There are a hundred million other ways to write these functions, sure, but if we wrote code to appease the personal tastes of every programmer in the world, we'd never get anything done.