python）使用正则表达式查找所有匹配项（从 re.search 更改为 re.findall）[重复]

Question

我正在尝试提取关键字 (Exhibit) 旁边的 所有匹配项 数字 (nn.nn)。例如，

through April 25, 2012

through April 25, 2012 

Exhibit 99.6 

Exhibit 99.10

这是我的代码。

import os,re
import numpy as np

os.chdir('C:\\Users\\dul\\Dropbox\\CTO\\test')


def extract_data(filename):
    with open(filename, 'r') as file1:
        text1=file1.read()

    matchexh = re.findall(r'Exhibit (\d+).(\d+)',text1)
    with open('outfile.txt', "a+") as outfile:
        outfile.write("\n"+matchexh)

files= os.listdir("C:\\Users\\dul\\Dropbox\\CTO\\test")
for file in files:
    if ".txt" in file:
        extract_data(file)

当我运行它时，我收到一条错误消息

File "C:\Users\dul\Dropbox\CTO\test\exhibitno.py", line 13, in extract_data  
   outfile.write("\n"+matchexh)  
TypeError: cannot concatenate 'str' and 'list' objects

如何获取所有匹配项并列出它们？

Answer 1

改变这个：

matchexh = re.search(r'Exhibit (\d+).(\d+)',text1).group().strip()

到：

matchexh = re.findall(r'Exhibit (\d+).(\d+)',text1)