From a430c2cbd3aa6e239808f11a9d9e7271bb8e220d Mon Sep 17 00:00:00 2001
From: Ramanpreet Nara <ramanpreet@fb.com>
Date: Fri, 12 Oct 2018 13:44:58 -0700
Subject: [PATCH] Fix crashes on invalid regex

Summary:
**Problem:**
When you type an invalid regex into the input field of the RNTester app, it crashes. What's worse is that it remembers the input string so refreshing the view doesn't get rid of the error. Observe:
https://pxl.cl/jdm3

Reviewed By: yungsters

Differential Revision: D10349249

fbshipit-source-id: aab5977bd47271e9a4ff6202c93b47550da778d2
---
 RNTester/js/RNTesterExampleList.js | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/RNTester/js/RNTesterExampleList.js b/RNTester/js/RNTesterExampleList.js
index 7ad207a8091..03b097f81dc 100644
--- a/RNTester/js/RNTesterExampleList.js
+++ b/RNTester/js/RNTesterExampleList.js
@@ -75,7 +75,18 @@ const renderSectionHeader = ({section}) => (
 class RNTesterExampleList extends React.Component<Props, $FlowFixMeState> {
   render() {
     const filterText = this.props.persister.state.filter;
-    const filterRegex = new RegExp(String(filterText), 'i');
+    let filterRegex = /.*/;
+
+    try {
+      filterRegex = new RegExp(String(filterText), 'i');
+    } catch (error) {
+      console.warn(
+        'Failed to create RegExp: %s\n%s',
+        filterText,
+        error.message,
+      );
+    }
+
     const filter = example =>
       /* $FlowFixMe(>=0.68.0 site=react_native_fb) This comment suppresses an
        * error found when Flow v0.68 was deployed. To see the error delete this