如何使用python中的正则表达式查找和计算文本文件中的每一行?

I have a text file that contains:

我有一个文本文件包含:

motion
black
lotion
mansion
cardio
sensational

How would I use a regular expression to print all the words that contain 'ion'? So it prints:

如何使用正则表达式打印包含“ion”的所有单词?所以它打印:

motion 
lotion
mansion 
sensational

When it prints I need it to print the word not in a string so it looks like:

当它打印时，我需要它打印单词而不是字符串，所以它看起来像:

motion

not

不

"motion"

The code I have so far is:

到目前为止，我的代码是:

import re
f = open("file.txt","r")
ex = re.findall("", f)
print ex

3 个解决方案

#1

import re
# file = open('filename').read()
file = '''
motion
black
lotion
mansion
cardio
sensational '''
matchs = re.findall(r'.+ion.*?', string=file)
for word in matchs:
    print(word)

out:

motion
lotion
mansion
sensation

#2

You can do this using a filter.

您可以使用过滤器来实现这一点。

Once you have a list of all the lines, use something like the following:

一旦你列出了所有的行，使用如下的方法:

def f(line):
    return re.match(r'ion', line)

matches = filter(f, all_lines)

The list matches will contain the subset of the lines in all_lines which contain 'ion'

列表匹配将包含all_lines的子集，其中包含“ion”

#3

import re
with open('file.txt') as f:
    for line in f.read().split('\n'):
        if re.search(r'ion', line):
            print line

Output : 
motion
lotion
mansion
sensational

#1

import re
# file = open('filename').read()
file = '''
motion
black
lotion
mansion
cardio
sensational '''
matchs = re.findall(r'.+ion.*?', string=file)
for word in matchs:
    print(word)