Add fast-path early returns in highlighters

- Skip regex matching when input lacks required separator
  characters (-, /, :) for date, time, and UUID highlighters

Author: bensadeh

src/core/highlighters/date_dash.rs

@@ -117,6 +117,10 @@ impl DateDashHighlighter {
 
 impl Highlight for DateDashHighlighter {
     fn apply<'a>(&self, input: &'a str) -> Cow<'a, str> {
+        if !input.as_bytes().contains(&b'-') && !input.as_bytes().contains(&b'/') {
+            return Cow::Borrowed(input);
+        }
+
         let mut it = self.regex.captures_iter(input).peekable();
         if it.peek().is_none() {
             return Cow::Borrowed(input);

src/core/highlighters/date_time.rs

@@ -76,8 +76,7 @@ impl TimeHighlighter {
 
 impl Highlight for TimeHighlighter {
     fn apply<'a>(&self, input: &'a str) -> Cow<'a, str> {
-        let mut it = self.regex.captures_iter(input).peekable();
-        if it.peek().is_none() {
+        if !input.as_bytes().contains(&b':') {
             return Cow::Borrowed(input);
         }
 

src/core/highlighters/uuid.rs

@@ -39,6 +39,10 @@ impl UuidHighlighter {
 
 impl Highlight for UuidHighlighter {
     fn apply<'a>(&self, input: &'a str) -> Cow<'a, str> {
+        if !input.as_bytes().contains(&b'-') {
+            return Cow::Borrowed(input);
+        }
+
         self.regex.replace_all(input, |caps: &Captures<'_>| {
             let matched = &caps[0];
             let mut buf = String::with_capacity(matched.len() + 32);