Kubernetes Pod Name (RFC 1123) in GO
Validate Kubernetes pod names per the RFC 1123 DNS label rules — lowercase, ≤63 chars, no leading/trailing hyphen.
Try it in the GO tester →Pattern
regexGO
^[a-z0-9](?:[a-z0-9\-]{0,61}[a-z0-9])?$Go (RE2) code
goGo
package main
import (
"fmt"
"regexp"
)
func main() {
re := regexp.MustCompile(`^[a-z0-9](?:[a-z0-9\-]{0,61}[a-z0-9])?$`)
input := `nginx-deployment-66b6c48dd5-abcd1`
for _, match := range re.FindAllString(input, -1) {
fmt.Println(match)
}
}Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.
How the pattern works
Stricter than the general hostname pattern: pod names must be LOWERCASE only (per K8s spec). [a-z0-9] for first char. (?:[a-z0-9\-]{0,61}[a-z0-9])? optionally allows up to 61 more chars ending in a non-hyphen. Total length ≤63 chars per RFC 1123 label limits.
Examples
Input
nginx-deployment-66b6c48dd5-abcd1Matches
nginx-deployment-66b6c48dd5-abcd1
Input
my-appMatches
my-app
Input
MyAppNo match
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