diff --git a/src/CalcManager/CEngine/calc.cpp b/src/CalcManager/CEngine/calc.cpp
index 6f93a600..f09151fe 100644
--- a/src/CalcManager/CEngine/calc.cpp
+++ b/src/CalcManager/CEngine/calc.cpp
@@ -19,8 +19,8 @@ static constexpr long DEFAULT_RADIX = 10;
 
 static constexpr wchar_t DEFAULT_DEC_SEPARATOR = L'.';
 static constexpr wchar_t DEFAULT_GRP_SEPARATOR = L',';
-static constexpr wstring_view DEFAULT_GRP_STR = L"3;0";
-static constexpr wstring_view DEFAULT_NUMBER_STR = L"0";
+static constexpr wstring_view DEFAULT_GRP_STR = L"3;0"sv;
+static constexpr wstring_view DEFAULT_NUMBER_STR = L"0"sv;
 
 // Read strings for keys, errors, trig types, etc.
 // These will be copied from the resources to local memory.
diff --git a/src/CalcManager/CEngine/scidisp.cpp b/src/CalcManager/CEngine/scidisp.cpp
index e01cc239..63c239cf 100644
--- a/src/CalcManager/CEngine/scidisp.cpp
+++ b/src/CalcManager/CEngine/scidisp.cpp
@@ -20,8 +20,8 @@ using namespace CalcEngine;
 
 constexpr int MAX_EXPONENT = 4;
 constexpr uint32_t MAX_GROUPING_SIZE = 16;
-constexpr wstring_view c_decPreSepStr = L"[+-]?(\\d*)[";
-constexpr wstring_view c_decPostSepStr = L"]?(\\d*)(?:e[+-]?(\\d*))?$";
+constexpr wstring_view c_decPreSepStr = L"[+-]?(\\d*)["sv;
+constexpr wstring_view c_decPostSepStr = L"]?(\\d*)(?:e[+-]?(\\d*))?$"sv;
 
 
 /****************************************************************************\