From 0cea3be102af7247b2fe2c8035a1bb38b7bf82ae Mon Sep 17 00:00:00 2001
From: vsv <vitaly.smetannikov@opencascade.com>
Date: Mon, 25 May 2015 15:17:02 +0300
Subject: [PATCH] Issue #559: Control doesn't have variable if its text is
 empty

---
 src/ModuleBase/ModuleBase_ParamSpinBox.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ModuleBase/ModuleBase_ParamSpinBox.cpp b/src/ModuleBase/ModuleBase_ParamSpinBox.cpp
index cce85ab35..5501b2655 100644
--- a/src/ModuleBase/ModuleBase_ParamSpinBox.cpp
+++ b/src/ModuleBase/ModuleBase_ParamSpinBox.cpp
@@ -157,12 +157,14 @@ bool ModuleBase_ParamSpinBox::isAcceptVariables() const
 
 bool ModuleBase_ParamSpinBox::hasVariable() const
 {
+  if (myTextValue.isEmpty())
+    return false;
   return hasVariable(myTextValue);
 }
 
 bool ModuleBase_ParamSpinBox::hasVariable(const QString& theText) const
 {
-  QRegExp varNameMask("[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?");
+  QRegExp varNameMask("[-+]?[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?");
   return !varNameMask.exactMatch(theText);
 }
 
-- 
2.39.2