Book Image

Hands-On Enterprise Automation with Python

By : Bassem Aly
Book Image

Hands-On Enterprise Automation with Python

By: Bassem Aly

Overview of this book

Hands-On Enterprise Automation with Python starts by covering the set up of a Python environment to perform automation tasks, as well as the modules, libraries, and tools you will be using. We’ll explore examples of network automation tasks using simple Python programs and Ansible. Next, we will walk you through automating administration tasks with Python Fabric, where you will learn to perform server configuration and administration, along with system administration tasks such as user management, database management, and process management. As you progress through this book, you’ll automate several testing services with Python scripts and perform automation tasks on virtual machines and cloud infrastructure with Python. In the concluding chapters, you will cover Python-based offensive security tools and learn how to automate your security tasks. By the end of this book, you will have mastered the skills of automating several system administration tasks with Python.
Table of Contents (20 chapters)

Introduction to regular expressions

Regular expressions are a language used to match specific occurrences of strings by following their pattern across the whole string. When a match is found, the resulting matched string will be returned back to user and will be held inside a structure in Python format, such as tuple, list, or dictionary. The following table summarizes the most common patterns in regular expressions:

Also, one of the important rules in regular expressions is you can write your own regex and surround it with parentheses (), which is called the capturing group and helps you to hold important data to reference it later using the capturing group number:

line = '30 acd3.b2c6.aac9 FastEthernet0/1' 
match = re.search('(\d+) +([0-9a-f.]+) +(\S+)', line)
print match.group(1)
print match.group(2)
PyCharm will automatically color strings written as regular...