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-rw-r--r--Lib/tokenize.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/tokenize.py b/Lib/tokenize.py
index e4c9d3c084..e41cd6eea4 100644
--- a/Lib/tokenize.py
+++ b/Lib/tokenize.py
@@ -127,7 +127,7 @@ Floatnumber = group(Pointfloat, Expfloat)
Imagnumber = group(r'[0-9]+[jJ]', Floatnumber + r'[jJ]')
Number = group(Imagnumber, Floatnumber, Intnumber)
-StringPrefix = r'(?:[uU][rR]?|[bB][rR]|[rR][bB]|[rR]|[uU])?'
+StringPrefix = r'(?:[uUbB][rR]?|[rR][bB]?)?'
# Tail end of ' string.
Single = r"[^'\\]*(?:\\.[^'\\]*)*'"