avoid recompiling the regular expression for each use in a while loop

Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
---
 BaseTools/Source/Python/AutoGen/UniClassObject.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/BaseTools/Source/Python/AutoGen/UniClassObject.py b/BaseTools/Source/Python/AutoGen/UniClassObject.py
index 856d19cda270..5c653f58e4ff 100644
--- a/BaseTools/Source/Python/AutoGen/UniClassObject.py
+++ b/BaseTools/Source/Python/AutoGen/UniClassObject.py
@@ -436,11 +436,11 @@ class UniFileClassObject(object):
             while (StartPos != -1):
                 EndPos = Line.find(u'\\', StartPos + 1, StartPos + 7)
                 if EndPos != -1 and EndPos - StartPos == 6 :
-                    if re.match('[a-fA-F0-9]{4}', Line[StartPos + 2 : EndPos], re.UNICODE):
+                    if g4HexChar.match(Line[StartPos + 2 : EndPos], re.UNICODE):
                         EndStr = Line[EndPos: ]
                         UniStr = ('\u' + (Line[StartPos + 2 : EndPos])).decode('unicode_escape')
                         if EndStr.startswith(u'\\x') and len(EndStr) >= 7:
-                            if EndStr[6] == u'\\' and re.match('[a-fA-F0-9]{4}', EndStr[2 : 6], re.UNICODE):
+                            if EndStr[6] == u'\\' and g4HexChar.match(EndStr[2 : 6], re.UNICODE):
                                 Line = Line[0 : StartPos] + UniStr + EndStr
                         else:
                             Line = Line[0 : StartPos] + UniStr + EndStr[1:]
-- 
2.16.2.windows.1

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