Shulou(Shulou.com)06/02 Report--

This article mainly introduces "how Python searches and replaces text in a case-insensitive way". In daily operations, I believe many people have doubts about how Python searches and replaces text in a case-insensitive way. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the question of "how Python can find and replace text in a case-insensitive way"! Next, please follow the editor to study!

1. Demand

We need to look in the text in a case-insensitive manner, and we may need to replace it.

2. Solution

To perform case-insensitive text operations, we need to use the re module and re.IGNORECASE tags on all kinds of operations.

Example:

Import retext='Mark is a handsome guy and mark is only 18 years old.'result1=re.findall ('mark',text,flags=re.IGNORECASE) result2=re.sub (' mark','python',text,flags=re.IGNORECASE) print (result1) print (result2)

Results:

['Mark',' mark'] python is a handsome guy and python is only 18 years old.

The above example reveals a limitation that although the name is replaced from [mark] to [python], the case does not match, for example, the first person's name should also be capitalized: [Pyhton].

If you want to correct this problem, you need to use a support function, as an example:

Import retext='Mark is a handsome guy and mark is only 18 years old.MARK'def matchcase (word): def replace (m): # re.sub will call the replace method to pass print (m) # to get the matching text text=m.group () if text.isupper (): # if the text is all uppercase, return all uppercase mode return word.upper () elif text.islower () of word: # if the text is all lowercase Return all lowercase mode return word.lower () elif text [0] .isupper () of word: # if the text is uppercase, return the uppercase mode of word return word.capitalize () else: # otherwise, directly return word return word return replaceresult=re.sub ('mark',matchcase (' python'), text,flags=re.IGNORECASE) print (result)

Running result:

Python is a handsome guy and python is only 18 years old.PYTHON

3. Analysis

For simple cases, simply adding the re.IGNORECASE tag is sufficient for case-insensitive matching.

At this point, the study on "how Python searches and replaces text in a case-insensitive way" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.