From 85185dbbaabd78ba82d2572561ab30019590adba Mon Sep 17 00:00:00 2001
From: Tanner Collin <git@tannercollin.com>
Date: Sat, 14 Mar 2026 15:20:54 -0600
Subject: [PATCH] fix: Replace regex with manual thousands separator

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
---
 calculator/calculator.app.js | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/calculator/calculator.app.js b/calculator/calculator.app.js
index afaa8a4..394a352 100644
--- a/calculator/calculator.app.js
+++ b/calculator/calculator.app.js
@@ -195,7 +195,19 @@ function fixFloat(n) {
 
 function addSeparators(s) {
   var parts = s.split(".");
-  parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",");
+  var intPart = parts[0];
+  var sign = "";
+  if (intPart[0] === "-") {
+    sign = "-";
+    intPart = intPart.slice(1);
+  }
+  var result = "";
+  while (intPart.length > 3) {
+    result = "," + intPart.slice(-3) + result;
+    intPart = intPart.slice(0, -3);
+  }
+  result = intPart + result;
+  parts[0] = sign + result;
   return parts.join(".");
 }