diff --git a/src/Gui/QuantitySpinBox.cpp b/src/Gui/QuantitySpinBox.cpp
index 8f4a1e49e3..98749a06b0 100644
--- a/src/Gui/QuantitySpinBox.cpp
+++ b/src/Gui/QuantitySpinBox.cpp
@@ -575,8 +575,9 @@ void QuantitySpinBox::userInput(const QString & text)
         // only emit signal to reset EditableDatumLabel if the input is truly empty or has
         // no meaningful number don't emit for partially typed numbers like "71." which are
         // temporarily invalid
-        QString trimmedText = text.trimmed();
-        if (trimmedText.isEmpty() || !trimmedText.contains(QRegularExpression(QStringLiteral("[0-9]")))) {
+        const QString trimmedText = text.trimmed();
+        static const QRegularExpression partialNumberRegex(QStringLiteral(R"([+-]?(\d+)?(\.,\d*)?)"));
+        if (trimmedText.isEmpty() || !trimmedText.contains(partialNumberRegex)) {
             // we have to emit here signal explicitly as validator will not pass
             // this value further but we want to check it to disable isSet flag if
             // it has been set previously