"cc-by-4" "cc by-4" "cc-by 4" "cc by 4" "cc-by-4.0" "cc by-4.0" "cc-by 4.0" "cc by 4.0"
creative commons 1
|((?!sa)((creative(\s|-|)))((commons(\s|-|))|)(?=(.+|)4))
/(cc[ \-]by[ \-]4(?:\.0)?)|((?=sa)((creative(\s|-|)))((commons(\s|-|))|)(?=(.+|)4))/gi