use once_cell to compile regex only once

Signed-off-by: keisku <[email protected]>

Cargo.toml

@@ -33,6 +33,7 @@ getset = "0.1.1"
 strum = "0.26.2"
 strum_macros = "0.26.2"
 regex = "1.10.5"
+once_cell = "1.19.0"
 
 [dev-dependencies]
 tempfile = "3.2.0"

src/runtime/process.rs

@@ -8,6 +8,7 @@ use regex::Regex;
 use serde::{de, Deserialize, Deserializer, Serialize};
 use std::path::PathBuf;
 use strum_macros::{Display as StrumDisplay, EnumString};
+use once_cell::sync::Lazy;
 
 #[derive(
     Builder,
@@ -622,10 +623,12 @@ where
     Ok(value)
 }
 
-fn validate_cpu_affinity(s: &str) -> Result<(), String> {
-    let re = Regex::new(r"^(\d+(-\d+)?)(,\d+(-\d+)?)*$").map_err(|e| e.to_string())?;
+static CPU_AFFINITY_REGEX: Lazy<Regex> = Lazy::new(|| {
+    Regex::new(r"^(\d+(-\d+)?)(,\d+(-\d+)?)*$").expect("Failed to create regex for execCPUAffinity")
+});
 
-    if !re.is_match(s) {
+fn validate_cpu_affinity(s: &str) -> Result<(), String> {
+    if !CPU_AFFINITY_REGEX.is_match(s) {
         return Err(format!("Invalid CPU affinity format: {}", s));
     }