diff --git a/circle.yml b/circle.yml
index 7ddef5208ab..745e2896336 100644
--- a/circle.yml
+++ b/circle.yml
@@ -8,13 +8,13 @@ dependencies:
 deployment:
   npm-latest:
     # match semver tag (e.g. 3.12.7)
-    tag: /\d\d?\.\d\d?\.\d\d?/
+    tag: /^\d\d?\.\d\d?\.\d\d?$/
     owner: palantir
     commands:
       - ./scripts/npmPublish.sh latest
   npm-next:
     # match semver tag with dev prerelease tag (e.g. 3.12.7-dev.2)
-    tag: /\d\d?\.\d\d?\.\d\d?-dev\.\d\d?/
+    tag: /^\d\d?\.\d\d?\.\d\d?-dev\.\d\d?$/
     owner: palantir
     commands:
       - ./scripts/npmPublish.sh next