From 1781a9da06d8881944b4589ea1e151eddf735f19 Mon Sep 17 00:00:00 2001
From: themias <89101928+themias@users.noreply.github.com>
Date: Wed, 24 May 2023 15:03:43 -0400
Subject: [PATCH] Fix ReplacementAccentSystem out of range exception (#16786)

---
 .../Speech/EntitySystems/ReplacementAccentSystem.cs           | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Content.Server/Speech/EntitySystems/ReplacementAccentSystem.cs b/Content.Server/Speech/EntitySystems/ReplacementAccentSystem.cs
index 0671a25201..36fa7e07ad 100644
--- a/Content.Server/Speech/EntitySystems/ReplacementAccentSystem.cs
+++ b/Content.Server/Speech/EntitySystems/ReplacementAccentSystem.cs
@@ -53,8 +53,10 @@ namespace Content.Server.Speech.EntitySystems
                 // this is kind of slow but its not that bad
                 // essentially: go over all matches, try to match capitalization where possible, then replace
                 // rather than using regex.replace
-                foreach (Match match in Regex.Matches(message, $@"(?<!\w){f}(?!\w)", RegexOptions.IgnoreCase))
+                for (int i = Regex.Count(message, $@"(?<!\w){f}(?!\w)", RegexOptions.IgnoreCase); i > 0; i--)
                 {
+                    // fetch the match again as the character indices may have changed
+                    Match match = Regex.Match(message, $@"(?<!\w){f}(?!\w)", RegexOptions.IgnoreCase);
                     var replacement = r;
 
                     // Intelligently replace capitalization