aaa $MY_NAME aaa bbb $MY_NAME bbb
ccc$MY_NAMEccc ddd $ MY_NAME ddd
Unset variable invalid default value: $A_NAME:-dafds
Set variable invalid default value: $MY_NAME:-dafds

eee${ MY_NAME }eee fff${ MY_NAME }fff
ggg${MY_NAME}ggg hhh${   MY_NAME   }hhh

www{{ MY_NAME }}www xxx{{ MY_NAME }}xxx
yyy{{MY_NAME}}yyy zzz{{   MY_NAME   }}zzz
