in reply to Custom error messages and moose
Type constraints allow custom error messages. So you could create an "IPAddress" type constraint as a subtype of "Str", and provide an error message for that.
See Moose::Util::TypeConstraints.
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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