如何使用python在正则表达式匹配后捕获5行

我有一个以3位代码开头的文本我写了一个逻辑来捕获当前行，但我需要连续捕获接下来的5行

import re
newtxt="200 sample text with many lines\n hell01 \n hell02 \n hell03 \n hell04 \n hell05\n hell06\n hell07 \n hell08"
text = re.compile(r'^\d{3} [a-z].*')
for line in newtxt.split('\n'):
       if text.match(line):
            print(line)

---

使用

iter

Ex:

import re
newtxt="200 sample text with many lines\n hell01 \n hell02 \n hell03 \n hell04 \n hell05\n hell06\n hell07 \n hell08"
text = re.compile(r'^\d{3} [a-z].*')
newtext = iter(newtxt.splitlines())
for line in newtext:
    if text.match(line):
        for _ in range(5):
            print(next(newtext))

 hell01 
 hell02 
 hell03 
 hell04 
 hell05

text = re.compile(r'^\d{3} [a-z].*')
with open(filename) as infile:
    for line in infile:
        if text.match(line):
            for _ in range(5):
                print(next(infile))

输出：

import re
newtxt="200 sample text with many lines\n hell01 \n hell02 \n hell03 \n hell04 \n hell05\n hell06\n hell07 \n hell08"
text = re.compile(r'^\d{3} [a-z].*')
newtext = iter(newtxt.splitlines())
for line in newtext:
    if text.match(line):
        for _ in range(5):
            print(next(newtext))

 hell01 
 hell02 
 hell03 
 hell04 
 hell05

text = re.compile(r'^\d{3} [a-z].*')
with open(filename) as infile:
    for line in infile:
        if text.match(line):
            for _ in range(5):
                print(next(infile))

---

如果您是从文件对象读取此文件，则不需要

iter

方法。您可以直接迭代这些行

Ex:

import re
newtxt="200 sample text with many lines\n hell01 \n hell02 \n hell03 \n hell04 \n hell05\n hell06\n hell07 \n hell08"
text = re.compile(r'^\d{3} [a-z].*')
newtext = iter(newtxt.splitlines())
for line in newtext:
    if text.match(line):
        for _ in range(5):
            print(next(newtext))

 hell01 
 hell02 
 hell03 
 hell04 
 hell05

text = re.compile(r'^\d{3} [a-z].*')
with open(filename) as infile:
    for line in infile:
        if text.match(line):
            for _ in range(5):
                print(next(infile))

你可以用

r'(?m)^\d{3} [a-z].*((?:\r?\n.*){0,5})'

看。注：代码中的

（？m）

可替换为

re.m

标志

详细信息

• ^

  -行的开头

• \d{3}[a-z]

  -三位数字、空格和一个小写字母

• *

  -行的其余部分

• （（？：\r？\n.*）{0,5}）

  -第1组：换行符的零到五次重复，然后是换行符的其余部分

:

输出：

 hell01 
 hell02 
 hell03 
 hell04 
 hell05

请查收。