diff --git a/internal/filter/git/git.go b/internal/filter/git/git.go
index 57aa99d..bb01bcb 100644
--- a/internal/filter/git/git.go
+++ b/internal/filter/git/git.go
@@ -26,7 +26,7 @@ https://github.com/git/git.git|*
 
 // default ref filter
 // refs/tags/<non-digits><version-number> -> version-number
-var refFilterRe = regexp.MustCompile(`^refs/tags/[^\d]*([\d\.\-]+)$`)
+var refFilterRe = regexp.MustCompile(`^refs/tags/[[:alpha:]]*([\d\.\-]+)$`)
 
 // New git filter
 func New(prefix string, arg string) (filter filter.Filter, err error) {