diff --git a/benchmark_test.go b/benchmark_test.go
index 672a7aa..f652df7 100644
--- a/benchmark_test.go
+++ b/benchmark_test.go
@@ -3,7 +3,7 @@ package main
 import (
 	"github.com/kaanaktas/go-slm/config"
 	"github.com/kaanaktas/go-slm/executor"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"testing"
@@ -17,7 +17,7 @@ func init() {
 
 	log.Println("Starting with number of worker", config.NumberOfWorker)
 	log.SetFlags(0)
-	log.SetOutput(ioutil.Discard)
+	log.SetOutput(io.Discard)
 }
 
 func Benchmark(b *testing.B) {
@@ -27,6 +27,7 @@ func Benchmark(b *testing.B) {
 	data := string(content)
 	serviceName := "test3"
 
+	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
 		executor.Apply(data, serviceName, config.Request)
 	}
diff --git a/datafilter/base.go b/datafilter/base.go
index 1314611..3a9e0bf 100644
--- a/datafilter/base.go
+++ b/datafilter/base.go
@@ -14,17 +14,17 @@ type Validator interface {
 
 // PatternValidator represents a validation rule based on a regular expression patternValidator.
 type patternValidator struct {
-	Name    string `json:"name"`
-	Rule    string `json:"rule"`
-	Sample  string `json:"sample"`
-	Message string `json:"message"`
-	Disable bool   `json:"disable"`
+	Name    string         `yaml:"name"`
+	Regex   *regexp.Regexp `yaml:"-"`
+	Rule    string         `yaml:"rule"`
+	Sample  string         `yaml:"sample"`
+	Message string         `yaml:"message"`
+	Disable bool           `yaml:"disable"`
 }
 
 // Validate checks whether the given data string satisfies the regular expression pattern.
 func (pv *patternValidator) Validate(data *string) bool {
-	matched, _ := regexp.MatchString(pv.Rule, *data)
-	return matched
+	return pv.Regex.MatchString(*data)
 }
 
 // ToString returns a string representation of the validation rule.
@@ -36,3 +36,7 @@ func (pv *patternValidator) ToString() string {
 func (pv *patternValidator) IsDisabled() bool {
 	return pv.Disable
 }
+
+func (pv *patternValidator) compileRule() {
+	pv.Regex = regexp.MustCompile(pv.Rule)
+}
diff --git a/datafilter/load.go b/datafilter/load.go
index 090a8ec..d3dc8f4 100644
--- a/datafilter/load.go
+++ b/datafilter/load.go
@@ -10,7 +10,7 @@ import (
 	"path/filepath"
 )
 
-//filter types
+// filter types
 const (
 	PAN   = "pan"
 	OWASP = "owasp"
@@ -50,10 +50,12 @@ func LoadDataFilterRules(dataFilterRuleSetPath string) {
 			switch set.Type {
 			case PAN:
 				for i, v := range patterns {
+					v.compileRule()
 					validateRule[i] = &pan{patternValidator: v}
 				}
 			case OWASP:
 				for i, v := range patterns {
+					v.compileRule()
 					validateRule[i] = &owasp{patternValidator: v}
 				}
 			}
diff --git a/datafilter/pan.go b/datafilter/pan.go
index 778c036..775a2fa 100644
--- a/datafilter/pan.go
+++ b/datafilter/pan.go
@@ -2,7 +2,6 @@ package datafilter
 
 import (
 	"math"
-	"regexp"
 	"strconv"
 	"strings"
 )
@@ -13,8 +12,7 @@ type pan struct {
 
 func (p *pan) Validate(data *string) bool {
 	dataWithoutSpace := strings.ReplaceAll(*data, " ", "")
-	r := regexp.MustCompile(p.Rule)
-	matchList := r.FindAllString(dataWithoutSpace, -1)
+	matchList := p.Regex.FindAllString(dataWithoutSpace, -1)
 	for _, v := range matchList {
 		if isValidPan(v) {
 			return true