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@rt = ( q/\b/, # standard word boundary q/(?:(?=\w)(?<!\w)|(?=\W)(?<!\W))/, # [japhy]-explicit-left ... print "[$try]$txt\n"; } }
[\b ]*this*, [(?:(?=\w)(?<!\w)|(?=\W)(?<!\W))]*this*, [(?:(?<=\w)(?!\w)|(?<=\W)(?!\W))]this*,* ... [(?(?=\w)(?<!\w)|(?<!\W)) ]*,*that* [(?(?<=\w)(?!\w)|(?!\W)) ],*that* [(?:(?=\w)(?<!\w)|(?!\w)(?<=\w))],*that*