> s='ababab abbabb aabaab'

> re.findall( r'\b("htmlcode">

> re.findall( r'b\(ab)+\b' , s )



结果：[‘ab']
这是因为如果只使用一对括号，那么这就成为了一个组(group)。组的使用比较复杂。
调试过程：


import re
#pattern = r'.*"F:\\shovat\\banners.txt","r")
data=f.read()
##data=f.readline()
f.close
#for line in data:
result=re.findall(pattern,data)
##print(result)
 # print(result)
 # print(result.group())
#t=(result.group())
 #t=(result.group(1))

f1=open("F:\\shovat\\test1.txt","w")
for i in result:
 f1.write(i+'\n')
f.close




banners.txt


ddd 1.1.1cisco ios software，c3750 software (c3750-ipbase-m),version
ddd 2.2.2 12.2(53)se,release softeware(fc2) 10.1.1 
ddd 3.3.3 technical support:http://www.cisco.com/techsupport
ddd 4.4.4 copyright (c) 1986-2009 by cisco systems,inc.
ddd 5.5.5 comiled sun 13-dec-09 16:25 by prod_rel_team
9.5




识别结果：
test1.txt

1.1.1

2.2.2

12.2

10.1.1

3.3.3

4.4.4

5.5.5

9.5

总结