diff --git a/test/support/test_helper.sh b/test/support/test_helper.sh
index cf211a6..ba9e472 100644
--- a/test/support/test_helper.sh
+++ b/test/support/test_helper.sh
@@ -15,7 +15,7 @@ fi
 
 # Strip color codes from a string
 strip_colors() {
-  sed -r "s/\x1B\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g"
+  perl -pe 's/\e\[[\d;]*m//g'
 }
 
 # Print space separated tab completion options