diff --git a/src/CalcViewModel/Common/CopyPasteManager.cpp b/src/CalcViewModel/Common/CopyPasteManager.cpp
index 00f13b52..207c4ef4 100644
--- a/src/CalcViewModel/Common/CopyPasteManager.cpp
+++ b/src/CalcViewModel/Common/CopyPasteManager.cpp
@@ -44,8 +44,8 @@ static const array<wregex, 1> standardModePatterns =
 };
 static const array<wregex, 2> scientificModePatterns =
 {
-    wregex(c_wspcLParens + c_signedDecFloat + c_wspcRParens),
-    wregex(c_wspcLParens + c_signedDecFloat + L"[e]([+]|[-])+\\d+" + c_wspcRParens)
+    wregex(L"[-+]?" + c_wspcLParens + c_signedDecFloat + c_wspcRParens),
+    wregex(L"[-+]?" + c_wspcLParens + c_signedDecFloat + L"[e]([+]|[-])+\\d+" + c_wspcRParens)
 };
 static const array<array<wregex, 5>, 4> programmerModePatterns =
 { {