From 7aca4aa8d0de74e01b1d3006837b103073c990c3 Mon Sep 17 00:00:00 2001
From: Filipp Riabchun <talpa@yandex.ru>
Date: Tue, 9 Feb 2021 18:45:44 +0200
Subject: [PATCH] Use a safer check for RegExp
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There’s a proposal for `Array#lastIndex` which may cause a false positive: https://github.com/tc39/proposal-array-last

see https://github.com/syntax-tree/mdast-util-find-and-replace/commit/536e7e5d23efd16dffb96fb0148eda922636940e#r46933368
---
 index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.js b/index.js
index d34516c..037add9 100644
--- a/index.js
+++ b/index.js
@@ -14,7 +14,7 @@ function findAndReplace(tree, find, replace, options) {
 
   if (
     typeof find === 'string' ||
-    (find && typeof find.lastIndex === 'number')
+    (find && typeof find.exec === 'function')
   ) {
     schema = [[find, replace]]
   } else {