Don't add regexp in front of ref

These are now implicitly added

Bug: 193100371
Change-Id: Ia09bd338a99a08446157392cdfba5a51421ac731
diff --git a/infra/config/global/main.star b/infra/config/global/main.star
index 76a8ba8..2c24c87 100755
--- a/infra/config/global/main.star
+++ b/infra/config/global/main.star
@@ -101,7 +101,7 @@
   bucket = "ci",
   repo = "https://r8.googlesource.com/r8",
   # Version branches are named d8-x.y (up until d8-1.5) or just x.y (from 1.6)
-  refs = ["regexp:refs/heads/(?:d8-)?[0-9]+\\.[0-9]+(\\.[0-9]+)?"],
+  refs = ["refs/heads/(?:d8-)?[0-9]+\\.[0-9]+(\\.[0-9]+)?"],
   path_regexps = ["src/main/java/com/android/tools/r8/Version.java"]
 )
 
@@ -109,7 +109,7 @@
     name = "main",
     title = "R8 Main Console",
     repo = "https://r8.googlesource.com/r8",
-    refs = ["regexp:refs/heads/.*"]
+    refs = ["refs/heads/.*"]
 )
 
 def builder_view(name, category, short_name):