如何用python查找和替换字符串

Question

有这样的字符串

100Usable by Everybody: Design Principles for Accessibility on Mac OS X 101What's New in Cocoa Touch 102What's New in Foundation for iOS 4 103iPad and iPhone User Interface Design 104Designing Apps with Scroll Views 308Developing Your App with Xcode 4 309Advanced Performance Analysis with Instruments 419OpenGL ES Tuning and Optimization 420OpenGL for Mac OS X 421Incorporating the Camera and Photo Library in your App 422Taking Advantage of Multiple GPUs

我想找到所有的数字子串，所以我得到了一组数字字符串，其中一个会像'100'。然后我修改它，在它前面附加'\n-'。所以最后我会得到一个这样的字符串

- 100 Usable by Everybody: Design Principles for Accessibility on Mac OS X 
- 101 What's New in Cocoa Touch 
- 102 What's New in Foundation for iOS 4 
- 103 iPad and iPhone User Interface Design 
- 104 Designing Apps with Scroll Views
- 308 Developing Your App with Xcode 4 
- 309 Advanced Performance Analysis with Instruments 
- 419 OpenGL ES Tuning and Optimization 
- 420 OpenGL for Mac OS X 
- 421 Incorporating the Camera and Photo Library in your App 
- 422 Taking Advantage of Multiple GPUs

我怎样才能用python做到这一点，请帮忙。非常感谢。

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找到数字子串后，我使用它。例如，我找到'100'，然后将其替换为'\n - 100'。

Answer 1

假设数字始终为 3 位数字（因为您在数据中嵌入了其他数字）：

data = "100Usable by Everybody: Design Principles for Accessibility on Mac OS X 101What's New in Cocoa Touch 102What's New in Foundation for iOS 4 103iPad and iPhone User Interface Design 104Designing Apps with Scroll Views 105Adopting Multitasking on iPhone OS, Part 1 106Understanding Document Interaction Controller 107Cocoa Tips and Tricks"

import re

new_data = re.sub(r'(\d{3})', '\n- \\1 ', data)
print(new_data)

给予：

- 100 Usable by Everybody: Design Principles for Accessibility on Mac OS X 
- 101 What's New in Cocoa Touch 
- 102 What's New in Foundation for iOS 4 
- 103 iPad and iPhone User Interface Design 
- 104 Designing Apps with Scroll Views 
- 105 Adopting Multitasking on iPhone OS, Part 1 
- 106 Understanding Document Interaction Controller 
- 107 Cocoa Tips and Tricks