diff --git a/Lib/email/quoprimime.py b/Lib/email/quoprimime.py
index 27c7ea55c7871f..3cdc88cc955ae4 100644
--- a/Lib/email/quoprimime.py
+++ b/Lib/email/quoprimime.py
@@ -39,8 +39,6 @@
'unquote',
]
-import re
-
from string import ascii_letters, digits, hexdigits
CRLF = '\r\n'
@@ -281,12 +279,7 @@ def decode(encoded, eol=NL):
decodestring = decode
-
-def _unquote_match(match):
- """Turn a match in the form =AB to the ASCII character with value 0xab"""
- s = match.group(0)
- return unquote(s)
-
+_HEX_TO_CHAR = {f'{i:02x}': chr(i) for i in range(256)}
# Header decoding is done a bit differently
def header_decode(s):
@@ -296,5 +289,29 @@ def header_decode(s):
quoted-printable (like =?iso-8859-1?q?Hello_World?=) -- please use
the high level email.header class for that functionality.
"""
- s = s.replace('_', ' ')
- return re.sub(r'=[a-fA-F0-9]{2}', _unquote_match, s, flags=re.ASCII)
+ # Check for regex =[a-fA-F0-9]{2}
+ s = s.replace("_", " ")
+
+ if '=' not in s:
+ return s
+
+ result = ''
+ s_len = len(s)
+ i = 0
+ last_append = 0
+
+ while i < s_len:
+ if s[i] == '=' and i + 2 < s_len:
+ if (hex_str := s[i + 1:i + 3].lower()) in _HEX_TO_CHAR:
+ if last_append < i:
+ result += s[last_append:i]
+ result += _HEX_TO_CHAR[hex_str]
+ i += 3
+ last_append = i
+ continue
+ i += 1
+
+ if last_append < s_len:
+ result += s[last_append:]
+
+ return result
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