how do find and replace string with python

Question

There is an string like this

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

I want to find all number substring, so I get an set of number string，one of them will be like ‘100’. Then I modify it, append '\n- ' before it. So finally I will get an string like this

- 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

How can i do this with python, please help. Thanks very much.

After find the number substring, I use it. For example, I find '100', then it will be replace with '\n - 100 '.

What's the logic here, why does it not add a line break at iOS 4? 4 is a number too. — Aran-Fey
– Aran-Fey, Commented Jul 8, 2016 at 7:12

cdarke · Accepted Answer · 2016-07-08 07:23:42Z

0

Assuming the number is always 3 digits (since you have other numbers embedded in the data):

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)

Gives:

- 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

answered Jul 8, 2016 at 7:23

cdarke

44.8k8 gold badges85 silver badges86 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

xiuchundao Over a year ago

So nice solution. Thank you very much.

cdarke Over a year ago

OK, one caveat: you must guarantee that the text data does not contain 3 digits anywhere!

xiuchundao Over a year ago

The text data always contain 3 digits. Thanks again.

Collectives™ on Stack Overflow

how do find and replace string with python

1 Answer 1

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related