diff --git a/src/atom/commands.pegjs b/src/atom/commands.pegjs
index 74f52b110..e287fbcf6 100644
--- a/src/atom/commands.pegjs
+++ b/src/atom/commands.pegjs
@@ -17,10 +17,13 @@ address
   }
 
 substitution
-  = "s" _ "/" find:([^/]*) "/" replace:([^/]*) "/" _ options:[g]* {
-    return new Substitution(find.join(''), replace.join(''), options);
+  = "s" _ "/" find:pattern "/" replace:pattern "/" _ options:[g]* {
+    return new Substitution(find, replace, options);
   }
 
+pattern
+  = pattern:[^/]* { return pattern.join('') }
+
 integer
   = digits:[0-9]+ { return parseInt(digits.join('')); }