Use precompiled regexes

lib/nntp/tiny/mbox.py

@@ -1,5 +1,3 @@
-import re
-
 from nntp.tiny.message import Message
 
 class MBoxReaderError(Exception):
@@ -42,7 +40,7 @@ class MBoxReaderBuffer():
         return self.lines[line][0:5] == 'From '
 
     def is_header_line(self, line):
-        return re.match(Message.HEADER_REGEX, self.lines[line]) is not None
+        return Message.RE_HEADER.match(self.lines[line]) is not None
 
     def is_start(self):
         if self.lines[0] is None or self.lines[1] is None:

lib/nntp/tiny/message.py

@@ -24,7 +24,8 @@ class MessageState(enum.Enum):
 class Message():
     __slots__ = 'state', 'headers', 'line', 'content', 'body', 'key',
 
-    HEADER_REGEX = '^([A-Za-z0-9\\-]+): (.*)$'
+    RE_HEADER     = re.compile(r'^([A-Za-z0-9\-]+): (.*)$')
+    RE_MESSAGE_ID = re.compile(r'^<([^<>]+)>$')
 
     def __init__(self):
         self.state   = MessageState.EMPTY
@@ -47,7 +48,7 @@ class Message():
             elif line[0] == ' ' or line[0] == '\t':
                 self.headers[self.key] += ' ' + decode(line.strip())
             else:
-                match = re.match(self.HEADER_REGEX, line)
+                match = self.RE_HEADER.match(line)
 
                 if match:
                     self.key = match[1].lower()