Regular Expression problem

[§ä´M¦Û¤vªº¤@¤ù¤Ñ]

I have the following source code

------------------------
import re
d = 'RTCB\r\nsignature:\xf1\x11
\xde\x10\xfe\x0f\x9c\x10\xf6\xc9_\x10\xf3\xeb<\x10\xf2Zt\x10\xef\xd2\x91\x10\xe6\xe7\xfb\x10\xe5p\x99\x10\xe2\x1e\xdf\x10\xdb\x0e\x9f\x10\xd8p\x06\x10\xce\xb3_\x10\xcc\x8d\xe2\x10\xc8\x00\xa4\x10\xc5\x994\x10\xc2={\x10\xc0\xdf\xda\x10\xbb\x03\xa3\x1
0\xb6E\n\x10\xacM\x12\x10\xa5`\xaa\x10\xa0\xaa\x1b\x10\x9bwy\x10\x9a\xc4w\x10\x95\xb6\xde\x10\x93o
\x10\x89N\xd3\x10\x86\xda=\x00\x00\x00\x00\x00\x00\x00\x00\r\ncef-ip:127.0.0.1\r\nsender-ip:152.100.123.77\r\n\r\n'
m = re.search('signature:(.*?)\r\n',d)

---------------------------

as you can see, there is "signature:..." in front of d

but re.search can not find the match object, it return None object...

i don't know why this happened??

(i have test other cases, but i met this string which can't be search for)

could anyone have any suggestions?

--
※Post by command       from 59-124-255-226.HINET-IP.
老鼠的香香乳酪洞˙電子佈告欄系統˙alexbbs.twbbs.org˙140.113.166.7