#2834: Change re module semantics, so that str and bytes mixing is forbidden,
and str (unicode) patterns get full unicode matching by default. The re.ASCII
flag is also introduced to ask for ASCII matching instead.
diff --git a/Lib/json/decoder.py b/Lib/json/decoder.py
index 5283eae..f0bc245 100644
--- a/Lib/json/decoder.py
+++ b/Lib/json/decoder.py
@@ -67,7 +67,7 @@
fn = getattr(context, 'parse_int', None) or int
res = fn(integer)
return res, None
-pattern(r'(-?(?:0|[1-9]\d*))(\.\d+)?([eE][-+]?\d+)?')(JSONNumber)
+pattern(r'(-?(?:0|[1-9][0-9]*))(\.[0-9]+)?([eE][-+]?[0-9]+)?')(JSONNumber)
STRINGCHUNK = re.compile(r'(.*?)(["\\\x00-\x1f])', FLAGS)