mvp

links/alphabet.go

@@ -2,7 +2,9 @@ package links
 
 import (
 	"crypto/rand"
+	"fmt"
 	"math/big"
+	"regexp"
 )
 
 const codeLength = 5
@@ -10,6 +12,7 @@ const codeLength = 5
 var (
 	alphabet       = "ABCDEFGHJKMNPQRSTUVWXYZ23456789"
 	alphabetLength = big.NewInt(int64(len(alphabet)))
+	ValidShortCode = regexp.MustCompile(fmt.Sprintf(`^/[%s]{%d}$`, alphabet, codeLength))
 )
 
 func randInt() int {