Uppercase in the example.

README.md

@@ -41,7 +41,7 @@ Here are the available options:
 
 -s, --pattern <PATTERN>
     Regular expression pattern to match against the filenames in the directory.
-    The pattern should contain match groups (expressed in parentheses). Example: "s(\d+)e(\d+).*\.(...)"
+    The pattern should contain match groups (expressed in parentheses). Example: "S(\d+)E(\d+).*\.(...)"
 
 -r, --replacement <REPLACEMENT>
     Replacement pattern for the matched filenames.

src/main.rs

@@ -13,7 +13,7 @@ struct Args {
     /// Regular expression pattern to match against the filenames in the directory.
     ///
     /// The pattern should contain match groups (expressed in parentheses).
-    /// Example: "s(\d+)e(\d+).*\.(...)"
+    /// Example: "S(\d+)E(\d+).*\.(...)"
     #[arg(short = 's', long)]
     pattern: String,