api/names.go
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 package api
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 import "regexp"
 
 // RestrictedNameChars collects the characters allowed to represent a name, normally used to validate container and volume names.
 const RestrictedNameChars = `[a-zA-Z0-9][a-zA-Z0-9_.-]`
 
 // RestrictedNamePattern is a regular expression to validate names against the collection of restricted characters.
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 var RestrictedNamePattern = regexp.MustCompile(`^` + RestrictedNameChars + `+$`)