From e7d48e0f5bfe9934e167ba21d158f11ef2513354 Mon Sep 17 00:00:00 2001
From: Joe Taylor <joe@princeton.edu>
Date: Tue, 22 Dec 2020 09:57:48 -0500
Subject: [PATCH] Revert "Allow 2x1 calls in the "strict_standard_callsign_re"
 regular expression."

This reverts commit 575a5c5a7a07ab9aa1332705ed12b2cd69971581.
---
 Radio.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Radio.cpp b/Radio.cpp
index ebb6c6fba..79b332fbd 100644
--- a/Radio.cpp
+++ b/Radio.cpp
@@ -22,7 +22,7 @@ namespace Radio
     QRegularExpression valid_callsign_regexp {R"(\d[[:alpha:]]|[[:alpha:]]\d)"};
 
     // standard callsign
-    QRegularExpression strict_standard_callsign_re {R"(^([A-Z]{1,2}[0-9]?|[0-9A-Z][A-Z])[0-9][A-Z]{0,3}$)"};
+    QRegularExpression strict_standard_callsign_re {R"(^([A-Z][0-9]?|[0-9A-Z][A-Z])[0-9][A-Z]{0,3}$)"};
 
     // suffixes that are often used and should not be interpreted as a
     // DXCC Entity prefix used as a suffix