From 6be307ffa8a1f4966f34b6b83dcdcc9d09d30cc5 Mon Sep 17 00:00:00 2001
From: Stephen Toub <stoub@microsoft.com>
Date: Sun, 9 Jun 2024 21:48:13 -0400
Subject: [PATCH] Use compiled Regex in
 InternalChatCompletionRequestMessageContentPartImageImageUrl

And source generated regex when the library eventually multitargets .NET 8
---
 ...CompletionRequestMessageContentPartImageImageUrl.cs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/Custom/Chat/Internal/InternalChatCompletionRequestMessageContentPartImageImageUrl.cs b/src/Custom/Chat/Internal/InternalChatCompletionRequestMessageContentPartImageImageUrl.cs
index 7d6665be..bfbc7cc6 100644
--- a/src/Custom/Chat/Internal/InternalChatCompletionRequestMessageContentPartImageImageUrl.cs
+++ b/src/Custom/Chat/Internal/InternalChatCompletionRequestMessageContentPartImageImageUrl.cs
@@ -8,6 +8,14 @@ namespace OpenAI.Chat;
 [CodeGenSuppress("InternalChatCompletionRequestMessageContentPartImageImageUrl", typeof(string))]
 internal partial class InternalChatCompletionRequestMessageContentPartImageImageUrl
 {
+#if NET8_0_OR_GREATER
+    [GeneratedRegex(@"^data:(?<type>.+?);base64,(?<data>.+)$")]
+    private static partial Regex ParseDataUriRegex();
+#else
+    private static Regex ParseDataUriRegex() => s_parseDataUriRegex;
+    private static readonly Regex s_parseDataUriRegex = new(@"^data:(?<type>.+?);base64,(?<data>.+)$", RegexOptions.Compiled);
+#endif
+
     private readonly Uri _imageUri = default;
     private readonly BinaryData _imageBytes = default;
     private readonly string _imageBytesMediaType = default;
@@ -47,7 +55,7 @@ public InternalChatCompletionRequestMessageContentPartImageImageUrl(BinaryData i
     /// <param name="serializedAdditionalRawData"> Keeps track of any properties unknown to the library. </param>
     internal InternalChatCompletionRequestMessageContentPartImageImageUrl(string url, ImageChatMessageContentPartDetail? detail, IDictionary<string, BinaryData> serializedAdditionalRawData)
     {
-        Match parsedDataUri = Regex.Match(url, @"^data:(?<type>.+?);base64,(?<data>.+)$");
+        Match parsedDataUri = ParseDataUriRegex().Match(url);
         
         if (parsedDataUri.Success)
         {