diff --git a/pkg/input/wordlist.go b/pkg/input/wordlist.go
index be487d6..135c7f5 100644
--- a/pkg/input/wordlist.go
+++ b/pkg/input/wordlist.go
@@ -3,7 +3,7 @@ package input
 import (
 	"bufio"
 	"os"
-	"strings"
+	"regexp"
 
 	"github.com/ffuf/ffuf/pkg/ffuf"
 )
@@ -91,11 +91,13 @@ func (w *WordlistInput) readFile(path string) error {
 
 	var data [][]byte
 	reader := bufio.NewScanner(file)
+	re := regexp.MustCompile(`(?i)%ext%`)
 	for reader.Scan() {
 		if w.config.DirSearchCompat && len(w.config.Extensions) > 0 {
-			if strings.Index(reader.Text(), "%EXT%") != -1 {
+			text := []byte(reader.Text())
+			if re.Match(text) {
 				for _, ext := range w.config.Extensions {
-					contnt := strings.Replace(reader.Text(), "%EXT%", ext, -1)
+					contnt := re.ReplaceAll(text, []byte(ext))
 					data = append(data, []byte(contnt))
 				}
 			} else {