不得不说正则是个好东西。
没错这次又用到正则表达式。
直接上代码：
# -*- coding: UTF-8 -*-
import re #使用正则库
# 打开文件
fo = open("hello.txt", "r");
co = open("world.txt", "r");
colines = co.readlines(); #读取所有world文件中的行
for line in fo.readlines(): #依次读取每行
line = line.strip(); #去掉每行头尾空白
matchObj = re.search( line, "%s" % colines, re.M | re.I);
#正则匹配开始，使用search可以将全部符合条件的字符集都找出来
if matchObj:
print line;
# 关闭文件
fo.close();
co.close();
hello.txt里面内容：
hello
world
good
nod
world.txt里面内容：
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaworldaaaaaaaaaaaaaaaaaaaaaa
bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbworldskkkkkkkkkkkkkkkkkkkkkkkkkkk
ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
dddddddddddddddddddddddddddddddddddd
dfgggggggggggggggggggggggggggggggggggggggg
ggggggggggggggggggggggggggggggggggggggggggggggg
eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
worldnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
wwwwwwwwwwwwwwwwwwwwwworldddddddddddddddddddddddddddddddddddd
dnmnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnhellolllllllllllllllllllllll
ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddqqqqqqqqqqqqqqqq
qqqqqqqqqqqneeeeeeeeeehello,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
sdfsdfffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
hello
ddddddddddddddddddddddddddddddddddddddddd
运行结果：
image.png
