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consul
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Consul is a distributed, highly available, and data center aware solution to connect and configure applications across dynamic, distributed infrastructure.
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consul/agent/dns/dns.go

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package dns
import "regexp"
// MaxLabelLength is the maximum length for a name that can be used in DNS.
const MaxLabelLength = 63
// InvalidNameRe is a regex that matches characters which can not be included in
// a DNS name.
var InvalidNameRe = regexp.MustCompile(`[^A-Za-z0-9\\-]+`)