diff --git a/astrocyte_pkg.yml b/astrocyte_pkg.yml
index a02c1c316ff56089ba61d386b82042610a2e1899..0030daebafd97e26a81397e0cbb508a7dbe1f2cb 100755
--- a/astrocyte_pkg.yml
+++ b/astrocyte_pkg.yml
@@ -85,13 +85,13 @@ workflow_parameters:
     required: true
     description: |
       One or more input tarball (+/- gunzip) basecall files (bcl) from a sequencing of 10x single-cell expereiment (can be .tar or .tar.gz).
-    regex: ".*tar*"
+    regex: ".*\\.tar*"
     min: 1
 
   - id: designFile
     type: file
     required: true
-    regex: ".*csv"
+    regex: ".*\\.csv"
     description: |
       A design file listing lane, sample, corresponding index.