[Patch] BaseTools: Allow string token identifier to use lower case letters

[Yonghong Zhu <yonghong.zhu@intel.com>]

This patch is to align the code behavior with UNI spec that string token
identifier can use upper case and lower case letters.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Felix <Felixp@ami.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
---
 BaseTools/Source/Python/AutoGen/UniClassObject.py | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/BaseTools/Source/Python/AutoGen/UniClassObject.py b/BaseTools/Source/Python/AutoGen/UniClassObject.py
index 183b2b2..856d19c 100644
--- a/BaseTools/Source/Python/AutoGen/UniClassObject.py
+++ b/BaseTools/Source/Python/AutoGen/UniClassObject.py
@@ -346,15 +346,15 @@ class UniFileClassObject(object):
     def GetStringObject(self, Item):
         Language = ''
         Value = ''
 
         Name = Item.split()[1]
-        # Check the string name is the upper character
+        # Check the string name
         if Name != '':
-            MatchString = re.match('[A-Z0-9_]+', Name, re.UNICODE)
+            MatchString = re.match('^[a-zA-Z][a-zA-Z0-9_]*$', Name, re.UNICODE)
             if MatchString == None or MatchString.end(0) != len(Name):
-                EdkLogger.error('Unicode File Parser', FORMAT_INVALID, 'The string token name %s defined in UNI file %s contains the invalid lower case character.' % (Name, self.File))
+                EdkLogger.error('Unicode File Parser', FORMAT_INVALID, 'The string token name %s defined in UNI file %s contains the invalid character.' % (Name, self.File))
         LanguageList = Item.split(u'#language ')
         for IndexI in range(len(LanguageList)):
             if IndexI == 0:
                 continue
             else:
@@ -516,15 +516,15 @@ class UniFileClassObject(object):
                     else:
                         IndexI = IndexJ
                         break
                 # Value = Value.replace(u'\r\n', u'')
                 Language = GetLanguageCode(Language, self.IsCompatibleMode, self.File)
-                # Check the string name is the upper character
+                # Check the string name
                 if not self.IsCompatibleMode and Name != '':
-                    MatchString = re.match('[A-Z0-9_]+', Name, re.UNICODE)
+                    MatchString = re.match('^[a-zA-Z][a-zA-Z0-9_]*$', Name, re.UNICODE)
                     if MatchString == None or MatchString.end(0) != len(Name):
-                        EdkLogger.error('Unicode File Parser', FORMAT_INVALID, 'The string token name %s defined in UNI file %s contains the invalid lower case character.' % (Name, self.File))
+                        EdkLogger.error('Unicode File Parser', FORMAT_INVALID, 'The string token name %s defined in UNI file %s contains the invalid character.' % (Name, self.File))
                 self.AddStringToList(Name, Language, Value)
                 continue
 
             #
             # Get string def information format 2 as below
-- 
2.6.1.windows.1