Python正则表达式匹配一行并替换

Question

需要有关python regex的帮助。 （用于文件比较程序）

以“ +”，“-”和“'”开头的参数解析文件。 （'+ <-SPACE->'，'-<-SPACE->'，'<-SPACE-> <-SPACE->'）。我需要用一些文字替换它。例子

我想将其替换为：-

Answer 1

尽管Gillespie的解决方案很棒，但是为了灵活性起见，我还是要使用regex。

我在下面提供了一些示例和用例

。

此格式为

re.sub(r'[+\-\s]{,4}((?:YOUR_QUERY_HERE[\s]*[\S]+(?=[\s]+|$)))', r'\n<p class="blue">\1</p>', string)

将YOUR_QUERY_HERE替换为您想要的内容

因此，您可以使用This[\s]*is[\s]*line[\s]*[\S]+

>>> import re

>>> string = '''+ This is line one
- This is line two
This is line three'''

>>> capture = re.sub(r'[+\-\s]{,4}?((?:This[\s]*is[\s]*line[\s]*[\S]+(?=[\s]+|$)))', r'\n<p class="blue">\1</p>', string)
>>> print(capture)

<p class="blue">This is line one</p>
<p class="blue">This is line two</p>
<p class="blue">This is line three</p>

。

如果文件中的行数不同，则可以像这样针对特定的组

>>> import re

>>> string = '''+ This is line one
- This is line two
  This is line three
+ Bobby has hobbies
- Meg is a brain
+ The pool hurts
  Manny is love
  This is line four
- The end of the world
- This is line five
+ This is line six
  Is upon us'''


>>> capture = re.sub(r'[+\-\s]{,4}?((?:This[\s]*is[\s]*line[\s]*[\S]+(?=[\s]+|$)))', r'\n<p class="blue">\1</p>', string)
>>> print(capture)

<p class="blue">This is line one</p>
<p class="blue">This is line two</p>
<p class="blue">This is line three</p>
+ Bobby has hobbies
- Meg is a brain
+ The pool hurts
  Manny is love
<p class="blue">This is line four</p>
- The end of the world
<p class="blue">This is line five</p>
<p class="blue">This is line six</p>
  Is upon us