TYPO3 Core

ext:redirects middleware collected all possible redirects,
thus evaluating all regexp redirects to find possible matches.
These collected possible redirects are looped afterwards and
checked, if redirect is active, meaning not having any start
and/or end time constraints or if time constrain is in the active
timespan, returning the first feasonable redirect. However this
evaluated all regexp redirects, even if flat redirects with query
arguments, flat redirects without query arguments or a regexp
redirect is found.