diff --git a/tools/licenses/lib/patterns.dart b/tools/licenses/lib/patterns.dart
index 395fd9e476d..41fd17e278a 100644
--- a/tools/licenses/lib/patterns.dart
+++ b/tools/licenses/lib/patterns.dart
@@ -4,10 +4,10 @@
 
 // COMMON PATTERNS
 
-const String kIndent = r'^((?:[-;#<!.\\"/* ]*(?:REM[-;#<!.\\"/* ]*)?[-;#<!.\"/*]+)?)( *)';
+const String kIndent = r'^((?:[-;@#<!.\\"/* ]*(?:REM[-;@#<!.\\"/* ]*)?[-;@#<!.\"/*]+)?)( *)';
 
 final RegExp stripDecorations = new RegExp(
-  r'^((?:(?:[-;#<!.\\"/* ]*(?:REM[-;#<!.\\"/* ]*)?[-;#<!.\"/*]+)?)(?:(?: |\t)*))(.*?)[ */]*$',
+  r'^((?:(?:[-;@#<!.\\"/* ]*(?:REM[-;@#<!.\\"/* ]*)?[-;@#<!.\"/*]+)?)(?:(?: |\t)*))(.*?)[ */]*$',
   multiLine: true,
   caseSensitive: false
 );