diff --git a/index.js b/index.js
index d3265f0..767cff2 100644
--- a/index.js
+++ b/index.js
@@ -5,14 +5,14 @@ var SafeBuffer = require('safe-buffer');
 
 Object.defineProperty(exports, 'commentRegex', {
   get: function getCommentRegex () {
-    return /^\s*\/(?:\/|\*)[@#]\s+sourceMappingURL=data:(?:application|text)\/json;(?:charset[:=]\S+?;)?base64,(?:.*)$/mg;
+    return /^\s*?\/(?:\/|\*?)[@#]\s+?sourceMappingURL=data:(?:application|text)\/json;(?:charset[:=]\S+?;)?base64,(?:.*?)$/mg;
   }
 });
 
 Object.defineProperty(exports, 'mapFileCommentRegex', {
   get: function getMapFileCommentRegex () {
     // Matches sourceMappingURL in either // or /* comment styles.
-    return /(?:\/\/[@#][ \t]+sourceMappingURL=([^\s'"`]+?)[ \t]*$)|(?:\/\*[@#][ \t]+sourceMappingURL=([^\*]+?)[ \t]*(?:\*\/){1}[ \t]*$)/mg;
+    return /(?:\/\/[@#][ \t]+?sourceMappingURL=([^\s'"`]+?)[ \t]*?$)|(?:\/\*[@#][ \t]+sourceMappingURL=([^*]+?)[ \t]*?(?:\*\/){1}[ \t]*?$)/mg;
   }
 });