From 1441829e5f35bdd637b81c8963b1ac057f6b0e02 Mon Sep 17 00:00:00 2001
From: jiexi <jiexiluan@gmail.com>
Date: Fri, 8 Mar 2024 09:04:46 -0800
Subject: [PATCH] fix: Fix `wallet_switchEthereumChain` chainId validation
 (#8883)
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## **Description**

This PR makes `wallet_switchEthereumChain` chainId validation better

## **Related issues**

## **Manual testing steps**

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

### **After**

## **Pre-merge author checklist**

- [x] I’ve followed [MetaMask Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've clearly explained what problem this PR is solving and how it
is solved.
- [x] I've linked related issues
- [x] I've included manual testing steps
- [x] I've included screenshots/recordings if applicable
- [ ] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.
- [ ] I’ve properly set the pull request status:
  - [ ] In case it's not yet "ready for review", I've set it to "draft".
- [ ] In case it's "ready for review", I've changed it from "draft" to
"non-draft".

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.
---
 app/util/regex/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/util/regex/index.ts b/app/util/regex/index.ts
index c8ea480b955..1612a2f02e1 100644
--- a/app/util/regex/index.ts
+++ b/app/util/regex/index.ts
@@ -36,7 +36,7 @@ export const regex: RegexTypes = {
   nonNumber: /[^0-9.]/g,
   number: /^(\d+(\.\d+)?)$/,
   portfolioUrl: new RegExp(`${AppConstants.PORTFOLIO_URL}/(?![a-z])`),
-  prefixedFormattedHexString: /^0x[1-9a-f]+[0-9a-f]*$/iu,
+  prefixedFormattedHexString: /^0x[1-9a-f][0-9a-f]*$/iu,
   privateCredentials: /"/g,
   protocol: /^[a-z]*:\/\//,
   replaceNetworkErrorSentry: /0x[A-Fa-f0-9]{40}/u,