diff --git a/lib/index.js b/lib/index.js
index 31ce7ff..bf2f8a3 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -49,7 +49,7 @@
       return tag
     }
 
-    return str.replace(/\[(\d+;)?(\d+)*m/g, function(match, b1, b2) {
+    return str.replace(/\[(\d{1,3};)?(\d{1,3})?m/g, function(match, b1, b2) {
       var i, code, res = ''
       if (b2 == '' || b2 == null) b2 = '0'
       for (i = 1; i < arguments.length - 2; i++) {