Due to the "exclude" support added in WP 4.4, single dashes were being converted to "NOT LIKE '%%'" clauses, causing all searches to fail. Props RomSocial, swissspidy. Fixes #36195. git-svn-id: https://develop.svn.wordpress.org/trunk@36989 602fd350-edb4-49c9-b593-d223f7449a82