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This article mainly introduces Python how to use regular expressions, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

Regular expression, or regex for short, is the description method of text pattern. You can search regex or regexp on google to get a lot of learning materials. This short article describes the steps to use regular expressions in python scripts:

1. Import re module

All the regular expression functions in Python are in the re module, and you can enter the following code in an interactive environment or in a script file. Import the module:

Import re

2. Create a regular expression object

Pass in a string value that represents a regular expression to re.compile (), which returns a Regex object. For example, to create a Regex object to match the phone number pattern, enter the following code:

PhoneMatch = phoneNumRegex.search ('My number is415-555-4242')

Now the phoneNumRegex contains a Regex object

3. Match Regex object

The search () method in the Regex object looks for the incoming string and looks for all matches of the regular expression.

PhoneMatch = phoneNumRegex.search ('My number is415-555-4242')

If the regular expression pattern is not found in the string, the search () method returns None. If the pattern is found, a Match object is returned. Match has a group () method that returns the actual matching text in the string being found:

Print ('Phone number found:' + phoneMatch.group ())

Pass the expected schema to re.compile () and save the resulting Regex object in phoneNumRegex. Then we call search () on phoneNumRegex, passing it the string we want to find. The result of the search is saved in the variable phoneMatch. The pattern is found in this string, so a Match object is returned. We can call group () on the phoneMatch variable and return the result of the match, showing the complete match, that is, 415555-4242.

Import rephoneNumRegex = re.compile (r'\ d\ d\ d -\ d\ d) phoneMatch = phoneNumRegex.search ('My number is415-555-4242') print ('Phonenumber found:' + phoneMatch.group ()) output: / / Phonenumber found: 415-555-4242 Thank you for reading this article carefully. I hope the article "how to use regular expressions in Python" shared by the editor will be helpful to you. At the same time, I hope you will support it. Pay attention to the industry information channel, more related knowledge is waiting for you to learn!

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