gistfile1.txt

expression => or_expression

or_expression => and_expression ["OR" and_expression]*
and_expression => predicate ["AND" predicate]*

predicate => "(" expression ")" | "NOT" expression | subreddit_test | score_test | day_test

subreddit_test => "subreddit IS " /^\/r\/[a-z0-9]+$/i
			| "subreddit MATCHES" /^\/r\/[a-z0-9*]+$/i

score_test => "score" "AT" ("LEAST"|"MOST") -? NUMBER

day_test => "today" "IS" day_of_week ["," day_of_week]*
	| "today" "IS A" part_of_week
day_of_week => "monday"|"tuesday"|"wednesday"|...|"sunday"
part_of_week => "weekday"|"weekend"