From a02f84528a43d7cb5e68bf7060e7b7abeecb00ee Mon Sep 17 00:00:00 2001
From: Sarah Barili <103978419+sarahbarili@users.noreply.github.com>
Date: Fri, 8 Nov 2024 09:11:44 -0700
Subject: [PATCH] Update internal/codespaces/rpc/invoker.go

Co-authored-by: Caleb Brose <5447118+cmbrose@users.noreply.github.com>
---
 internal/codespaces/rpc/invoker.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/internal/codespaces/rpc/invoker.go b/internal/codespaces/rpc/invoker.go
index e00b6c304..6ba8843ac 100644
--- a/internal/codespaces/rpc/invoker.go
+++ b/internal/codespaces/rpc/invoker.go
@@ -307,7 +307,7 @@ func (i *invoker) notifyCodespaceOfClientActivity(ctx context.Context, activity
 
 func isUsernameValid(username string) bool {
 	// assuming valid usernames are alphanumeric, with these special characters allowed: . _ -
-	var validUsernamePattern = `^[a-zA-Z0-9._-]+$`
+	var validUsernamePattern = `^[a-zA-Z0-9_][-.a-zA-Z0-9_]*$`
 	re := regexp.MustCompile(validUsernamePattern)
 	return re.MatchString(username)
 }