diff --git a/src/guess_is_regexp.js b/src/guess_is_regexp.js
index 2c5747d..f99af54 100644
--- a/src/guess_is_regexp.js
+++ b/src/guess_is_regexp.js
@@ -30,6 +30,8 @@ var REGEXP_PRECEDER_TOKEN_RE = new RegExp(
     + "|,"    // Second binary operand cannot start a division.
     + "|[*]"  // Ditto binary operand.
   + ")$"
+  // Or match empty string
+  + "|^$"
   // Or match a token that ends with one of the characters below to match
   // a variety of punctuation tokens.
   // Some of the single char tokens could go above, but putting them below