Avoid matching sourceMappingURL inside a template string

NOTE: Multi-line template strings are not protected against.

This commit also updates the comment above the 'sourceMappingURL'
regular expression that would cause a false positive when this
library parses itself (which can happen when two packages depend
on this library).

index.js

@@ -10,9 +10,8 @@ Object.defineProperty(exports, 'commentRegex', {
 
 Object.defineProperty(exports, 'mapFileCommentRegex', {
   get: function getMapFileCommentRegex () {
-    //Example (Extra space between slashes added to solve Safari bug. Exclude space in production):
-    //     / /# sourceMappingURL=foo.js.map           /*# sourceMappingURL=foo.js.map */
-    return /(?:\/\/[@#][ \t]+sourceMappingURL=([^\s'"]+?)[ \t]*$)|(?:\/\*[@#][ \t]+sourceMappingURL=([^\*]+?)[ \t]*(?:\*\/){1}[ \t]*$)/mg;
+    // Matches sourceMappingURL in either // or /* comment styles.
+    return /(?:\/\/[@#][ \t]+sourceMappingURL=([^\s'"`]+?)[ \t]*$)|(?:\/\*[@#][ \t]+sourceMappingURL=([^\*]+?)[ \t]*(?:\*\/){1}[ \t]*$)/mg;
   }
 });