First try at url validation
First try at url validation

codeandtheory/cartodb,bloomberg/cartodb,bloomberg/cartodb,CartoDB/cartodb,CartoDB/cartodb,CartoDB/cartodb,splashblot/dronedb,CartoDB/cartodb,codeandtheory/cartodb,bloomberg/cartodb,codeandtheory/cartodb,splashblot/dronedb,codeandtheory/cartodb,splashblot/dronedb,splashblot/dronedb,bloomberg/cartodb,codeandtheory/cartodb,CartoDB/cartodb,splashblot/dronedb,bloomberg/cartodb