o8n: remove redundant 1B headmarker regexes
o8n: remove redundant 1B headmarker regexes

quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,sqt/cactbot,sqt/cactbot,sqt/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,sqt/cactbot,sqt/cactbot