Index: sources/gui/qml/globals/Variables.qml
===================================================================
diff -u -r5c21e83a3fdc897cb99ac62e1cec0213f411cd73 -r6f73e3ec5ba15c5c6ecc59191462e64e3bc36dfc
--- sources/gui/qml/globals/Variables.qml	(.../Variables.qml)	(revision 5c21e83a3fdc897cb99ac62e1cec0213f411cd73)
+++ sources/gui/qml/globals/Variables.qml	(.../Variables.qml)	(revision 6f73e3ec5ba15c5c6ecc59191462e64e3bc36dfc)
@@ -201,6 +201,11 @@
                 return notSetVariableText
     }
 
+    // it is prefered to use the regExp instead of the RegExpValidator
+    // otherwise an extra RegExpValidator object will always created here.
+    readonly property var regExp_PatientID: /[A-Za-z0-9]{1,20}/
+
+
     readonly property string preTreatmentStepLabelCreate            : qsTr("CREATE"   )
     readonly property string preTreatmentStepLabelConfirm           : qsTr("CONFIRM"  )
     readonly property string preTreatmentStepLabelPriming           : qsTr("PRIME"    )
Index: sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateStack.qml
===================================================================
diff -u -r108450c58851ff7c48c4607494b8cdae59952908 -r6f73e3ec5ba15c5c6ecc59191462e64e3bc36dfc
--- sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateStack.qml	(.../PreTreatmentCreateStack.qml)	(revision 108450c58851ff7c48c4607494b8cdae59952908)
+++ sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateStack.qml	(.../PreTreatmentCreateStack.qml)	(revision 6f73e3ec5ba15c5c6ecc59191462e64e3bc36dfc)
@@ -72,6 +72,9 @@
             }
             textInput.inputMethodHints  : Qt.ImhPreferLowercase
             textInput.echoMode          : TextInput.Normal
+            textInput.validator         : RegExpValidator {
+                regExp: Variables.regExp_PatientID
+            }
         }
     }
 
Index: sources/model/hd/alarm/MAlarmMapping.cpp
===================================================================
diff -u -r108450c58851ff7c48c4607494b8cdae59952908 -r6f73e3ec5ba15c5c6ecc59191462e64e3bc36dfc
--- sources/model/hd/alarm/MAlarmMapping.cpp	(.../MAlarmMapping.cpp)	(revision 108450c58851ff7c48c4607494b8cdae59952908)
+++ sources/model/hd/alarm/MAlarmMapping.cpp	(.../MAlarmMapping.cpp)	(revision 6f73e3ec5ba15c5c6ecc59191462e64e3bc36dfc)
@@ -7,7 +7,7 @@
  *                                                                                 
  * \file    MAlarmMapping.cpp                                                     
  * \author  (last)      Behrouz NematiPour                                        
- * \date    (last)      14-Jan-2022                                                        
+ * \date    (last)      18-Jan-2022                                                        
  * \author  (original)  Behrouz NematiPour                                        
  * \date    (original)  03-May-2021                                               
  *