Pluralize 'regular expression(s)' to indicate you may submit more than one expression.

(05:04:30) <@nasonfish> techkid6, I can't tell if you know this or not but you can submit as many regexes as you want for each round, it takes the highest scoring one and uses it
(05:06:18) <techkid6> nasonfish: at first I DIDN'T know this
(05:06:22) <@nasonfish> okay, just checking, some people make the mistake of only submitting one
(05:06:24) <techkid6> then like, 10 rounds in, someone told me :P