Regular expression does not match multi-line string

Regular expression does not match multi-line string: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). $ gawk 'BEGIN{VAR="a\nb"; print match(VAR, /^a. b$/)}' 1 $ mawk 'BEGIN{VAR="a\nb"; print match(VAR, /^a. b$/)}' 1