diff --git a/BaseTools/Source/Python/Common/Expression.py b/BaseTools/Source/Python/Common/Expression.py
index 320f001500..462e8f93f8 100644
--- a/BaseTools/Source/Python/Common/Expression.py
+++ b/BaseTools/Source/Python/Common/Expression.py
@@ -43,6 +43,7 @@ ERR_IN_OPERAND          = 'Macro after IN operator can only be: $(FAMILY), $(ARC
 __ValidString = re.compile(r'[_a-zA-Z][_0-9a-zA-Z]*$')
 _ReLabel = re.compile('LABEL\((\w+)\)')
 _ReOffset = re.compile('OFFSET_OF\((\w+)\)')
+PcdPattern = re.compile(r'[_a-zA-Z][0-9A-Za-z_]*\.[_a-zA-Z][0-9A-Za-z_]*$')
 
 ## SplitString
 #  Split string to list according double quote
@@ -214,7 +215,6 @@ class ValueExpression(object):
 
     NonLetterOpLst = ['+', '-', '*', '/', '%', '&', '|', '^', '~', '<<', '>>', '!', '=', '>', '<', '?', ':']
 
-    PcdPattern = re.compile(r'[_a-zA-Z][0-9A-Za-z_]*\.[_a-zA-Z][0-9A-Za-z_]*$')
 
     SymbolPattern = re.compile("("
                                  "\$\([A-Z][A-Z0-9_]*\)|\$\(\w+\.\w+\)|\w+\.\w+|"
@@ -616,7 +616,7 @@ class ValueExpression(object):
             raise BadExpression(ERR_EMPTY_TOKEN)
 
         # PCD token
-        if self.PcdPattern.match(self._Token):
+        if PcdPattern.match(self._Token):
             if self._Token not in self._Symb:
                 Ex = BadExpression(ERR_PCD_RESOLVE % self._Token)
                 Ex.Pcd = self._Token
diff --git a/BaseTools/Source/Python/Common/RangeExpression.py b/BaseTools/Source/Python/Common/RangeExpression.py
index 5fcc8a432a..5ee59184e6 100644
--- a/BaseTools/Source/Python/Common/RangeExpression.py
+++ b/BaseTools/Source/Python/Common/RangeExpression.py
@@ -16,6 +16,7 @@ from Common.GlobalData import *
 from CommonDataClass.Exceptions import BadExpression
 from CommonDataClass.Exceptions import WrnExpression
 import uuid
+from Common.Expression import PcdPattern
 
 ERR_STRING_EXPR = 'This operator cannot be used in string expression: [%s].'
 ERR_SNYTAX = 'Syntax error, the rest of expression cannot be evaluated: [%s].'
@@ -209,8 +210,6 @@ class RangeExpression(object):
 
     NonLetterOpLst = ['+', '-', '&', '|', '^', '!', '=', '>', '<']
 
-    PcdPattern = re.compile(r'[_a-zA-Z][0-9A-Za-z_]*\.[_a-zA-Z][0-9A-Za-z_]*$')
-    
     RangePattern = re.compile(r'[0-9]+ - [0-9]+')
 
     def preProcessRangeExpr(self, expr):
@@ -573,7 +572,7 @@ class RangeExpression(object):
             raise BadExpression(ERR_EMPTY_TOKEN)
 
         # PCD token
-        if self.PcdPattern.match(self._Token):
+        if PcdPattern.match(self._Token):
             if self._Token not in self._Symb:
                 Ex = BadExpression(ERR_PCD_RESOLVE % self._Token)
                 Ex.Pcd = self._Token