expand regex and document

src/main.rs

@@ -9,18 +9,40 @@ struct Cli {
 
 fn main() -> anyhow::Result<()> {
     let cli = Cli::parse();
-    let re = regex::Regex::new(
+    let field_re = r"(.*?)";
-        r"^(.*?)[\t\s]+(.*?)[\t\s]+(.*?)[\t\s]+(.*?)[\t\s]+(.*?)[\t\s]+(.*?)[\t\s]+(.*?)[\t\s]+(.*)$",
+    let message_re = r"(.*)";
-    )?;
+    let delimitier_re = r"[\t\s]+";
+    let re = regex::Regex::new(&format!(
+        r"^{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}$",
+        field_re, // 1 Log Level
+        delimitier_re,
+        field_re, // 2 Timestamp
+        delimitier_re,
+        field_re, // 3 Version
+        delimitier_re,
+        field_re, // 4 Site
+        delimitier_re,
+        field_re, // 5 Invocation
+        delimitier_re,
+        field_re, // 6 Label 1
+        delimitier_re,
+        field_re, // 7 Label 2
+        delimitier_re,
+        message_re, // 8 Message
+    ))?;
     for line in read_to_string(cli.input)?.lines() {
         if let Some(caps) = re.captures(line) {
             // println!("{:#?}", &caps);
             println!(
                 "{} {:5} {} {} {}",
-                &caps[2], &caps[1], &caps[6], &caps[7], &caps[8]
+                &caps[2], // timestamp
+                &caps[1], // log level
+                &caps[6], // label 1
+                &caps[7], // label 2
+                &caps[8]  // message
             );
         } else {
-            println!("{}", line);
+            println!("XXX {}", line);
         }
     }
     Ok(())