--- a/eric6/ThirdParty/Pygments/pygments/lexers/bibtex.py	Tue Apr 21 19:44:19 2020 +0200
+++ b/eric6/ThirdParty/Pygments/pygments/lexers/bibtex.py	Tue Apr 21 19:47:10 2020 +0200
@@ -5,7 +5,7 @@
 
     Lexers for BibTeX bibliography data and styles
 
-    :copyright: Copyright 2006-2017 by the Pygments team, see AUTHORS.
+    :copyright: Copyright 2006-2019 by the Pygments team, see AUTHORS.
     :license: BSD, see LICENSE for details.
 """
 
@@ -33,7 +33,7 @@
     flags = re.IGNORECASE
 
     ALLOWED_CHARS = r'@!$&*+\-./:;<>?\[\\\]^`|~'
-    IDENTIFIER = '[{0}][{1}]*'.format('a-z_' + ALLOWED_CHARS, r'\w' + ALLOWED_CHARS)
+    IDENTIFIER = '[{}][{}]*'.format('a-z_' + ALLOWED_CHARS, r'\w' + ALLOWED_CHARS)
 
     def open_brace_callback(self, match, ctx):
         opening_brace = match.group()