(?:)
/(?:)/g
(?:)
/(?:)/i
(?:)
/(?:)/m
a\tb
/a\tb/gi
a	b
/a	b/gi
a\tb
/a\tb/gm
a\nb
/a\nb/gm
a\nb
/a\nb/im
a\nb
/a\nb/im
a\x0ab
/a\x0ab/gim
a\nb
/a\nb/gim
a\x0ab
/a\x0ab/gim
a\u000ab
/a\u000ab/gim
a\nb
/a\nb/gim
a\u000ab
/a\u000ab/gim