Add package semver

Signed-off-by: Jan Tytgat <jan.tytgat@corelayer.eu>

pkg/semver/metadata.go

@@ -0,0 +1,23 @@
+package semver
+
+import (
+	"fmt"
+	"regexp"
+)
+
+const (
+	validMetadata = `^(?P<commit>[0-9a-zA-Z]{8}).(?P<date>[0-9]{8})$`
+)
+
+var regexMetadata = regexp.MustCompile(validMetadata)
+
+type Metadata string
+
+func SplitMetadata(m Metadata) (string, string, error) {
+	if !regexMetadata.MatchString(string(m)) {
+		return "", "", fmt.Errorf("invalid metadata: %s", m)
+	}
+
+	match := regexMetadata.FindStringSubmatch(string(m))
+	return match[1], match[2], nil
+}