diff --git a/Cargo.lock b/Cargo.lock
index 2822920785d..bba48e09dc6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "addr2line"
 version = "0.15.2"
@@ -1306,6 +1308,7 @@ version = "0.100.0-pre"
 dependencies = [
  "ckb-fixed-hash",
  "linked-hash-map",
+ "once_cell",
  "parking_lot",
  "regex",
 ]
diff --git a/util/Cargo.toml b/util/Cargo.toml
index 6eb60155f8c..f55ba166a1a 100644
--- a/util/Cargo.toml
+++ b/util/Cargo.toml
@@ -12,6 +12,7 @@ repository = "https://github.com/nervosnetwork/ckb"
 parking_lot = "0.11"
 linked-hash-map = "0.5"
 regex = "1.1.6"
+once_cell = "1.8.0"
 
 [dev-dependencies]
 ckb-fixed-hash = { path = "fixed-hash", version = "= 0.100.0-pre" }
diff --git a/util/src/strings.rs b/util/src/strings.rs
index be51674a621..d124cc0926c 100644
--- a/util/src/strings.rs
+++ b/util/src/strings.rs
@@ -18,24 +18,18 @@ use regex::Regex;
 /// ```
 pub fn check_if_identifier_is_valid(ident: &str) -> Result<(), String> {
     const IDENT_PATTERN: &str = r#"^[0-9a-zA-Z_-]+$"#;
+    static RE: once_cell::sync::OnceCell<Regex> = once_cell::sync::OnceCell::new();
+    // IDENT_PATTERN is a correct regular expression, so unwrap here
+    let re = RE.get_or_init(|| Regex::new(IDENT_PATTERN).unwrap());
+
     if ident.is_empty() {
         return Err("the identifier shouldn't be empty".to_owned());
     }
-    match Regex::new(IDENT_PATTERN) {
-        Ok(re) => {
-            if !re.is_match(&ident) {
-                return Err(format!(
-                    "invaild identifier \"{}\", the identifier pattern is \"{}\"",
-                    ident, IDENT_PATTERN
-                ));
-            }
-        }
-        Err(err) => {
-            return Err(format!(
-                "invalid regular expression \"{}\": {}",
-                IDENT_PATTERN, err
-            ));
-        }
+    if !re.is_match(ident) {
+        return Err(format!(
+            "Invalid identifier \"{}\", the identifier pattern is \"{}\"",
+            ident, IDENT_PATTERN
+        ));
     }
     Ok(())
 }