1*7c568831SAndroid Build Coastguard Worker=>(a|b{0,3}){0,1} 2*7c568831SAndroid Build Coastguard Workera 3*7c568831SAndroid Build Coastguard Workeraa 4*7c568831SAndroid Build Coastguard Workerb 5*7c568831SAndroid Build Coastguard Workerbb 6*7c568831SAndroid Build Coastguard Workerbbb 7*7c568831SAndroid Build Coastguard Workerbbbb 8*7c568831SAndroid Build Coastguard Workerab 9*7c568831SAndroid Build Coastguard Workerba 10*7c568831SAndroid Build Coastguard Worker=>([0-9]{0,3}|([0-9]{0}|[0-9]{0,3})){0,3} 11*7c568831SAndroid Build Coastguard Worker0 12*7c568831SAndroid Build Coastguard Worker00 13*7c568831SAndroid Build Coastguard Worker123 14*7c568831SAndroid Build Coastguard Workerabc 15