Revex

As an active reddit user, clam frequently browses r/ProgrammerHumor. However, the reposts about how hard regex is makes him go >:((((. So, clam decided to show them who's boss.

^(?=.re)(?=.{21}[^]{4}}$)(?=.{14}b[^]{2})(?=.{8}[C-L])(?=.{8}[B-F])(?=.{8}[^B-DF])(?=.{7}G(?..).{7}t\k)(?=.u[^z].$)(?=.{11}(?[13])s.{2}(?!\k)[13]s)(?=..{2})(?=actf{)(?=.{21}[p-t])(?=.1.3)(?=.{20}(?=.u)(?=.y)(?=.z)(?=.q)(?=._))(?=.*Ex)