Python-如何在string.replace中输入正则表达式?

我需要一些帮助来声明正则表达式。我的输入如下:

this is a paragraph with<[1> in between</[1> and then there are cases ... where the<[99> number ranges from 1-100</[99>. 

and there are many other lines in the txt files

with<[3> such tags </[3>

所需的输出是:

this is a paragraph with in between and then there are cases ... where the number ranges from 1-100. 

and there are many other lines in the txt files

with such tags

我已经试过了:

#!/usr/bin/python

import os, sys, re, glob

for infile in glob.glob(os.path.join(os.getcwd(), '*.txt')):

for line in reader:

line2 = line.replace('<[1> ', '')

line = line2.replace('</[1> ', '')

line2 = line.replace('<[1>', '')

line = line2.replace('</[1>', '')

print line

我也尝试过此方法(但似乎我使用了错误的regex语法):

    line2 = line.replace('<[*> ', '')

line = line2.replace('</[*> ', '')

line2 = line.replace('<[*>', '')

line = line2.replace('</[*>', '')

我不想replace从1到99 进行硬编码。。。

回答:

这个经过测试的代码段应该做到这一点:

import re

line = re.sub(r"</?\[\d+>", "", line)

编辑:这是一个注释的版本,说明其工作方式:

line = re.sub(r"""

(?x) # Use free-spacing mode.

< # Match a literal '<'

/? # Optionally match a '/'

\[ # Match a literal '['

\d+ # Match one or more digits

> # Match a literal '>'

""", "", line)

正则表达式很有趣!但我强烈建议你花一两个小时来学习基础知识。对于初学者,你需要了解哪些特殊字符:需要转义的“元字符”(即,前面加反斜杠-字符类的内外规则是不同的。)在以下位置有一个出色的在线教程:www .regular-expressions.info。你在那里度过的时间将使自己获得很多倍的回报。

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