[rajaravivarma_r]

I always wanted to do something like this. Because I always forgot how to do the 'look ahead' assertions.

I even named the library 'hu_regex', where 'hu' stands for human, but never did anything further, as I couldn't think of any good builder patter for regex that seemed intuitive.

Anyway, thanks for this. This comment section has introduced some good libraries as well.