rewrite filteReddit.arrayContainsSubstring's into easier-to-read if's
filteReddit.arrayContainsSubstring sanity check that array contains rows
filteReddit.arrayContainsSubstring converts searchString to regexp if it resembles a regexp

i.e. /pattern/flags
better sanitizing on exceptString
filteReddit.arrayContainsSubstring -renamed obj to filters
filteReddit.arrayContainsSubstring uses filteReddit.filters(type) to fetch filters array
rename filteReddit.arrayContainsSubstring to filtersMatchString
whoops ctrl+h
preprocess filteReddit filters
fix filterDomain - wrong option name
fix "have filters for this type changed since preprocessed?" sanity check
fix applyTo reference
single point of return for filteReddit.filterMatchesString
filteReddit option descriptions describe which fields support regexp
Merge pull request #1822 from andytuba/filtereddit-regex

filteReddit regex support, refactoring