Imports of package validations

PathSynopsis
errorsPackage errors implements functions to manipulate errors.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/prometheus/client_model/go
reflectPackage reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types.
regexpPackage regexp implements regular expression search.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.