diff --git a/caching_parser.go b/caching_parser.go
index b66002e..5da59a1 100644
--- a/caching_parser.go
+++ b/caching_parser.go
@@ -1,7 +1,6 @@
 package expr
 
 import (
-	"regexp"
 	"sync"
 	"sync/atomic"
 
@@ -10,8 +9,7 @@ import (
 )
 
 var (
-	doubleQuoteMatch *regexp.Regexp
-	replace          = []string{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t"}
+	replace = []string{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t"}
 )
 
 // NewCachingParser returns a CELParser which lifts quoted literals out of the expression