See e.g. [[q:it:Speciale:AbuseFilter/examine/310666]] (feel free to temporarily add yourself to local sysop group, if you want) i.e. http://it.wikiquote.org/?diff=304888 :
(new_wikitext rlike ("===? *Senza fonte *===?[^=]+" + added_lines))
gives false while it's expected to give true (and it seems to do so if added_lines is one line only, e.g. here: http://it.wikiquote.org/w/index.php?title=Speciale:AbuseLog&details=179 : if this is the correct behaviour change bug summary), but if you remove parenthesis it always gives true, even if you check
(new_wikitext rlike "nonexistentstring" + "===? *Senza fonte *===?[^=]+")
or
(new_wikitext rlike "===? *Senza fonte *===?[^=]+" + "nonexistentstring")

Version: unspecified
Severity: normal