diff --git a/helper.go b/helper.go
index 16d4a61..069e353 100644
--- a/helper.go
+++ b/helper.go
@@ -7,10 +7,11 @@ import (
 	"unicode"
 )
 
+var selectCapitalRegexp = regexp.MustCompile(SelectCapital)
+
 func caseHelper(input string, isCamel bool, rule ...string) []string {
 	if !isCamel {
-		re := regexp.MustCompile(SelectCapital)
-		input = re.ReplaceAllString(input, ReplaceCapital)
+		input = selectCapitalRegexp.ReplaceAllString(input, ReplaceCapital)
 	}
 	input = strings.Join(strings.Fields(strings.TrimSpace(input)), " ")
 	if len(rule) > 0 && len(rule)%2 != 0 {
diff --git a/stringy.go b/stringy.go
index d8a0161..bfcad0d 100644
--- a/stringy.go
+++ b/stringy.go
@@ -10,6 +10,8 @@ import (
 	"unicode"
 )
 
+var matchWordRegexp = regexp.MustCompile(`[\s]*[\W]\pN`)
+
 // input is struct that holds input from user and result
 type input struct {
 	Input  string
@@ -228,9 +230,8 @@ func (i *input) LcFirst() string {
 
 // Lines returns slice of strings by removing white space characters
 func (i *input) Lines() []string {
-	input := getInput(*i)
-	matchWord := regexp.MustCompile(`[\s]*[\W]\pN`)
-	result := matchWord.ReplaceAllString(input, " ")
+	input := getInput(*i) 
+	result := matchWordRegexp.ReplaceAllString(input, " ")
 	return strings.Fields(strings.TrimSpace(result))
 }