1 files changed, 20 insertions, 0 deletions
diff --git a/syn/examples/lazy-static/example/src/main.rs b/syn/examples/lazy-static/example/src/main.rs
new file mode 100644
index 0000000..c4f64af
--- /dev/null
+++ b/syn/examples/lazy-static/example/src/main.rs
@@ -0,0 +1,20 @@
+use lazy_static::lazy_static;
+use regex::Regex;
+
+lazy_static! {
+    static ref USERNAME: Regex = {
+        println!("Compiling username regex...");
+        Regex::new("^[a-z0-9_-]{3,16}$").unwrap()
+    };
+}
+
+fn main() {
+    println!("Let's validate some usernames.");
+    validate("fergie");
+    validate("will.i.am");
+}
+
+fn validate(name: &str) {
+    // The USERNAME regex is compiled lazily the first time its value is accessed.
+    println!("is_match({:?}): {}", name, USERNAME.is_match(name));
+}