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

In this issue, the editor will bring you the specific operation methods of compiling Python regular expressions. The article is rich in content and analyzes and describes for you from a professional point of view. I hope you can get something after reading this article.

Now that we've seen some simple regular expressions, how do I use Python regular expressions in practice? The re module provides an interface to the regular expression engine that allows you to compile REs into objects and use them for matching.

Compile Python regular expressions

Regular expressions are compiled into an instance of `RegexObject`, which provides methods for different operations, such as pattern matching search or string replacement.

#! python > import re > p = re.compile ('ab*')

> > print p

Re.compile ()

Optional flag parameters are also accepted and are often used to implement different special functions and syntax changes. We'll look at all the available settings later, but for now just one example:

#! python > p = re.compile ('ab*', re.IGNORECASE)

RE is sent to re.compile () as a string. REs is treated as a string because regular expressions are not a core part of the Python language and no specific syntax is created for it. Applications don't need REs at all, so there's no need to include them to make the language specification bloated. The re module is only included by Python as a C extension module, just like the socket or zlib module.

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