fix typo and regular expression of algorithim

regular expression of algorithim in defs-image.json: "pattern": "^[a-z0-9]+:[a-fA-F0-9]+$" make descriptor.md consistent with it. Signed-off-by: Deng Guangxing <dengguangxing@huawei.com>
opencontainers · Sep 8, 2016 · af00de0 · af00de0
1 parent 9a93cca
commit af00de0
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/descriptor.md b/descriptor.md
@@ -60,7 +60,7 @@ The digest string matches the following grammar:
 
 ```
 digest      := algorithm ":" hex
-algorithm   := /[A-Fa-f0-9_+.-]+/
+algorithm   := /[a-z0-9]+/
 hex         := /[A-Fa-f0-9]+/
 ```