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You're reading from Mastering Python Regular Expressions

Product type Book

Published in Feb 2014

Publisher Packt

ISBN-13 9781783283156

Pages 110 pages

Edition 1st Edition

Languages

Python

Concepts

Programming Language

Table of Contents (12) Chapters

Mastering Python Regular Expressions

Credits

About the Authors

About the Reviewers

www.PacktPub.com

Preface

1. Introducing Regular Expressions

2. Regular Expressions with Python

3. Grouping

4. Look Around

5. Performance of Regular Expressions

Index

Compilation flags

When compiling a pattern string into a pattern object, it's possible to modify the standard behavior of the patterns. In order to do that, we have to use the compilation flags. These can be combined using the bitwise OR "|".

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Flag	Python	Description
`re.IGNORECASE` or `re.I`	2.x 3.x	The pattern will match lower case and upper case.
`re.MULTILINE` or `re.M`	2.x 3.x	This flag changes the behavior of two metacharacters: `^`: Which now matches at the beginning of the string and at the beginning of each new line. `$`: In this case, it matches at the end of the string and the end of each line. Concretely, it matches right before the newline character.
`re.DOTALL` or `re.S`	2.x 3.x	The metacharacter "`.`" will match any character even the newline.
`re.LOCALE` or `re.L`	2.x 3.x	This flag makes \w, \W, \b, \B, \s, and \S dependent on the current locale. "re.LOCALE just passes the character to the underlying C library. It really only works on bytestrings which have 1 byte per character. UTF...