diff --git a/pkg/uuid/testdata/uuid.txtar b/pkg/uuid/testdata/uuid.txtar
index 3544788ff..62d26639f 100644
--- a/pkg/uuid/testdata/uuid.txtar
+++ b/pkg/uuid/testdata/uuid.txtar
@@ -45,20 +45,12 @@ urn: a:     uuid.URN(sha1.a)
 toInt: a:   uuid.ToInt(sha1.a)
 -- out/uuid-v3 --
 Errors:
-valid.err.a: invalid value "052ef62d_7223_58b6_a551_c1deee46d401" (does not satisfy uuid.Valid): invalid UUID "052ef62d_7223_58b6_a551_c1deee46d401":
+valid.err.a: invalid value "052ef62d_7223_58b6_a551_c1deee46d401" (does not satisfy uuid.Valid): invalid UUID format:
     ./in.cue:16:5
-valid.err.b: invalid value "052ef62d-7223-58b6-a551-c1deee" (does not satisfy uuid.Valid): invalid UUID "052ef62d-7223-58b6-a551-c1deee":
+valid.err.b: invalid value "052ef62d-7223-58b6-a551-c1deee" (does not satisfy uuid.Valid): invalid UUID length: 30:
     ./in.cue:17:5
-valid.err.c: invalid value "{123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): invalid UUID "{123e4567-e89b-12d3-a456-426655440000":
+valid.err.c: invalid value "{123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): invalid UUID length: 37:
     ./in.cue:18:5
-valid.ok.b: invalid value "052EF62D-7223-58B6-A551-C1DEEE46D401" (does not satisfy uuid.Valid): invalid UUID "052EF62D-7223-58B6-A551-C1DEEE46D401":
-    ./in.cue:9:5
-valid.ok.c: invalid value "urn:uuid:123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): invalid UUID "urn:uuid:123e4567-e89b-12d3-a456-426655440000":
-    ./in.cue:10:5
-valid.ok.d: invalid value "{123e4567-e89b-12d3-a456-426655440000}" (does not satisfy uuid.Valid): invalid UUID "{123e4567-e89b-12d3-a456-426655440000}":
-    ./in.cue:11:5
-valid.ok.e: invalid value "123e4567e89b12d3a456426655440000" (does not satisfy uuid.Valid): invalid UUID "123e4567e89b12d3a456426655440000":
-    ./in.cue:12:5
 parse.err.a: error in call to uuid.Parse: invalid UUID format:
     ./in.cue:35:13
 parse.err.b: error in call to uuid.Parse: invalid UUID length: 30:
@@ -88,15 +80,15 @@ invalidTable: {
 valid: {
 	ok: {
 		a: "052ef62d-7223-58b6-a551-c1deee46d401"
-		b: _|_ // valid.ok.b: invalid value "052EF62D-7223-58B6-A551-C1DEEE46D401" (does not satisfy uuid.Valid): valid.ok.b: invalid UUID "052EF62D-7223-58B6-A551-C1DEEE46D401"
-		c: _|_ // valid.ok.c: invalid value "urn:uuid:123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): valid.ok.c: invalid UUID "urn:uuid:123e4567-e89b-12d3-a456-426655440000"
-		d: _|_ // valid.ok.d: invalid value "{123e4567-e89b-12d3-a456-426655440000}" (does not satisfy uuid.Valid): valid.ok.d: invalid UUID "{123e4567-e89b-12d3-a456-426655440000}"
-		e: _|_ // valid.ok.e: invalid value "123e4567e89b12d3a456426655440000" (does not satisfy uuid.Valid): valid.ok.e: invalid UUID "123e4567e89b12d3a456426655440000"
+		b: "052EF62D-7223-58B6-A551-C1DEEE46D401"
+		c: "urn:uuid:123e4567-e89b-12d3-a456-426655440000"
+		d: "{123e4567-e89b-12d3-a456-426655440000}"
+		e: "123e4567e89b12d3a456426655440000"
 	}
 	err: {
-		a: _|_ // valid.err.a: invalid value "052ef62d_7223_58b6_a551_c1deee46d401" (does not satisfy uuid.Valid): valid.err.a: invalid UUID "052ef62d_7223_58b6_a551_c1deee46d401"
-		b: _|_ // valid.err.b: invalid value "052ef62d-7223-58b6-a551-c1deee" (does not satisfy uuid.Valid): valid.err.b: invalid UUID "052ef62d-7223-58b6-a551-c1deee"
-		c: _|_ // valid.err.c: invalid value "{123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): valid.err.c: invalid UUID "{123e4567-e89b-12d3-a456-426655440000"
+		a: _|_ // valid.err.a: invalid value "052ef62d_7223_58b6_a551_c1deee46d401" (does not satisfy uuid.Valid): valid.err.a: invalid UUID format
+		b: _|_ // valid.err.b: invalid value "052ef62d-7223-58b6-a551-c1deee" (does not satisfy uuid.Valid): valid.err.b: invalid UUID length: 30
+		c: _|_ // valid.err.c: invalid value "{123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): valid.err.c: invalid UUID length: 37
 	}
 }
 parse: {
@@ -132,29 +124,17 @@ toInt: {
 diff old new
 --- old
 +++ new
-@@ -1,25 +1,18 @@
+@@ -1,13 +1,10 @@
  Errors:
- valid.err.a: invalid value "052ef62d_7223_58b6_a551_c1deee46d401" (does not satisfy uuid.Valid): invalid UUID "052ef62d_7223_58b6_a551_c1deee46d401":
+ valid.err.a: invalid value "052ef62d_7223_58b6_a551_c1deee46d401" (does not satisfy uuid.Valid): invalid UUID format:
      ./in.cue:16:5
 -    ./in.cue:26:13
- valid.err.b: invalid value "052ef62d-7223-58b6-a551-c1deee" (does not satisfy uuid.Valid): invalid UUID "052ef62d-7223-58b6-a551-c1deee":
+ valid.err.b: invalid value "052ef62d-7223-58b6-a551-c1deee" (does not satisfy uuid.Valid): invalid UUID length: 30:
      ./in.cue:17:5
 -    ./in.cue:26:13
- valid.err.c: invalid value "{123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): invalid UUID "{123e4567-e89b-12d3-a456-426655440000":
+ valid.err.c: invalid value "{123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): invalid UUID length: 37:
      ./in.cue:18:5
 -    ./in.cue:26:13
- valid.ok.b: invalid value "052EF62D-7223-58B6-A551-C1DEEE46D401" (does not satisfy uuid.Valid): invalid UUID "052EF62D-7223-58B6-A551-C1DEEE46D401":
-     ./in.cue:9:5
--    ./in.cue:23:12
- valid.ok.c: invalid value "urn:uuid:123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): invalid UUID "urn:uuid:123e4567-e89b-12d3-a456-426655440000":
-     ./in.cue:10:5
--    ./in.cue:23:12
- valid.ok.d: invalid value "{123e4567-e89b-12d3-a456-426655440000}" (does not satisfy uuid.Valid): invalid UUID "{123e4567-e89b-12d3-a456-426655440000}":
-     ./in.cue:11:5
--    ./in.cue:23:12
- valid.ok.e: invalid value "123e4567e89b12d3a456426655440000" (does not satisfy uuid.Valid): invalid UUID "123e4567e89b12d3a456426655440000":
-     ./in.cue:12:5
--    ./in.cue:23:12
  parse.err.a: error in call to uuid.Parse: invalid UUID format:
      ./in.cue:35:13
  parse.err.b: error in call to uuid.Parse: invalid UUID length: 30:
@@ -162,27 +142,15 @@ diff old new
 Missing error positions.
 -- out/uuid --
 Errors:
-valid.err.a: invalid value "052ef62d_7223_58b6_a551_c1deee46d401" (does not satisfy uuid.Valid): invalid UUID "052ef62d_7223_58b6_a551_c1deee46d401":
+valid.err.a: invalid value "052ef62d_7223_58b6_a551_c1deee46d401" (does not satisfy uuid.Valid): invalid UUID format:
     ./in.cue:16:5
     ./in.cue:26:13
-valid.err.b: invalid value "052ef62d-7223-58b6-a551-c1deee" (does not satisfy uuid.Valid): invalid UUID "052ef62d-7223-58b6-a551-c1deee":
+valid.err.b: invalid value "052ef62d-7223-58b6-a551-c1deee" (does not satisfy uuid.Valid): invalid UUID length: 30:
     ./in.cue:17:5
     ./in.cue:26:13
-valid.err.c: invalid value "{123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): invalid UUID "{123e4567-e89b-12d3-a456-426655440000":
+valid.err.c: invalid value "{123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): invalid UUID length: 37:
     ./in.cue:18:5
     ./in.cue:26:13
-valid.ok.b: invalid value "052EF62D-7223-58B6-A551-C1DEEE46D401" (does not satisfy uuid.Valid): invalid UUID "052EF62D-7223-58B6-A551-C1DEEE46D401":
-    ./in.cue:9:5
-    ./in.cue:23:12
-valid.ok.c: invalid value "urn:uuid:123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): invalid UUID "urn:uuid:123e4567-e89b-12d3-a456-426655440000":
-    ./in.cue:10:5
-    ./in.cue:23:12
-valid.ok.d: invalid value "{123e4567-e89b-12d3-a456-426655440000}" (does not satisfy uuid.Valid): invalid UUID "{123e4567-e89b-12d3-a456-426655440000}":
-    ./in.cue:11:5
-    ./in.cue:23:12
-valid.ok.e: invalid value "123e4567e89b12d3a456426655440000" (does not satisfy uuid.Valid): invalid UUID "123e4567e89b12d3a456426655440000":
-    ./in.cue:12:5
-    ./in.cue:23:12
 parse.err.a: error in call to uuid.Parse: invalid UUID format:
     ./in.cue:35:13
 parse.err.b: error in call to uuid.Parse: invalid UUID length: 30:
@@ -212,15 +180,15 @@ invalidTable: {
 valid: {
 	ok: {
 		a: "052ef62d-7223-58b6-a551-c1deee46d401"
-		b: _|_ // valid.ok.b: invalid value "052EF62D-7223-58B6-A551-C1DEEE46D401" (does not satisfy uuid.Valid): valid.ok.b: invalid UUID "052EF62D-7223-58B6-A551-C1DEEE46D401"
-		c: _|_ // valid.ok.c: invalid value "urn:uuid:123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): valid.ok.c: invalid UUID "urn:uuid:123e4567-e89b-12d3-a456-426655440000"
-		d: _|_ // valid.ok.d: invalid value "{123e4567-e89b-12d3-a456-426655440000}" (does not satisfy uuid.Valid): valid.ok.d: invalid UUID "{123e4567-e89b-12d3-a456-426655440000}"
-		e: _|_ // valid.ok.e: invalid value "123e4567e89b12d3a456426655440000" (does not satisfy uuid.Valid): valid.ok.e: invalid UUID "123e4567e89b12d3a456426655440000"
+		b: "052EF62D-7223-58B6-A551-C1DEEE46D401"
+		c: "urn:uuid:123e4567-e89b-12d3-a456-426655440000"
+		d: "{123e4567-e89b-12d3-a456-426655440000}"
+		e: "123e4567e89b12d3a456426655440000"
 	}
 	err: {
-		a: _|_ // valid.err.a: invalid value "052ef62d_7223_58b6_a551_c1deee46d401" (does not satisfy uuid.Valid): valid.err.a: invalid UUID "052ef62d_7223_58b6_a551_c1deee46d401"
-		b: _|_ // valid.err.b: invalid value "052ef62d-7223-58b6-a551-c1deee" (does not satisfy uuid.Valid): valid.err.b: invalid UUID "052ef62d-7223-58b6-a551-c1deee"
-		c: _|_ // valid.err.c: invalid value "{123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): valid.err.c: invalid UUID "{123e4567-e89b-12d3-a456-426655440000"
+		a: _|_ // valid.err.a: invalid value "052ef62d_7223_58b6_a551_c1deee46d401" (does not satisfy uuid.Valid): valid.err.a: invalid UUID format
+		b: _|_ // valid.err.b: invalid value "052ef62d-7223-58b6-a551-c1deee" (does not satisfy uuid.Valid): valid.err.b: invalid UUID length: 30
+		c: _|_ // valid.err.c: invalid value "{123e4567-e89b-12d3-a456-426655440000" (does not satisfy uuid.Valid): valid.err.c: invalid UUID length: 37
 	}
 }
 parse: {
diff --git a/pkg/uuid/uuid.go b/pkg/uuid/uuid.go
index 4b19d59c3..d164a5259 100644
--- a/pkg/uuid/uuid.go
+++ b/pkg/uuid/uuid.go
@@ -18,26 +18,14 @@
 package uuid
 
 import (
-	"fmt"
 	"math/big"
-	"regexp"
-	"sync"
 
 	"github.com/google/uuid"
 )
 
-var valid = sync.OnceValue(func() *regexp.Regexp {
-	return regexp.MustCompile("^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$")
-})
-
-// TODO(mvdan): should Valid not use [uuid.Validate]?
-
-// Valid can be used to define a valid Valid.
+// Valid ensures that s is a valid UUID which would be accepted by Parse.
 func Valid(s string) error {
-	if !valid().MatchString(string(s)) {
-		return fmt.Errorf("invalid UUID %q", s)
-	}
-	return nil
+	return uuid.Validate(s)
 }
 
 // Parse decodes s into a UUID or returns an error. Both the standard UUID forms
@@ -50,6 +38,8 @@ func Parse(s string) (string, error) {
 	return string(x.String()), err
 }
 
+// TODO(mvdan): what is ToString meant to do? it appears like a no-op?
+
 // String represents a 128-bit UUID value as a string.
 func ToString(x string) string {
 	return string(x)