diff --git a/base/string.go b/base/string.go
index 266f37d..330ce75 100644
--- a/base/string.go
+++ b/base/string.go
@@ -177,3 +177,16 @@ func HasJPReg(data string) bool {
 	}
 	return false
 }
+
+// KeepRegexCharacter keep all character matched in regex
+func KeepRegexCharacter(str, regexStr string) (rs string, err error) {
+	if str == "" {
+		return
+	}
+	reg, err := regexp.Compile(regexStr)
+	if err != nil {
+		return
+	}
+	rs = reg.ReplaceAllString(str, "")
+	return
+}
diff --git a/main.go b/main.go
index b5c153e..314afeb 100644
--- a/main.go
+++ b/main.go
@@ -10,7 +10,13 @@ import (
 )
 
 func main() {
-	vs()
+	dt()
+}
+
+func dt() {
+	s, r := base.KeepRegexCharacter("ex v1.2.3 data", "[a-zA-Z]")
+	fmt.Println(s)
+	fmt.Println(r)
 }
 
 func vs() {