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You're reading from  Python for Secret Agents - Volume II - Second Edition

Product typeBook
Published inDec 2015
Reading LevelIntermediate
Publisher
ISBN-139781785283406
Edition2nd Edition
Languages
Python
Concepts
Cybersecurity
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Authors (2):
Steven F. Lott
Steven F. Lott
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Steven F. Lott

Steven Lott has been programming since computers were large, expensive, and rare. Working for decades in high tech has given him exposure to a lot of ideas and techniques, some bad, but most are helpful to others. Since the 1990s, Steven has been engaged with Python, crafting an array of indispensable tools and applications. His profound expertise has led him to contribute significantly to Packt Publishing, penning notable titles like "Mastering Object-Oriented," "The Modern Python Cookbook," and "Functional Python Programming." A self-proclaimed technomad, Steven's unconventional lifestyle sees him residing on a boat, often anchored along the vibrant east coast of the US. He tries to live by the words “Don't come home until you have a story.”
Read more about Steven F. Lott

Steven F. Lott
Steven F. Lott
author image
Steven F. Lott

Steven Lott has been programming since computers were large, expensive, and rare. Working for decades in high tech has given him exposure to a lot of ideas and techniques, some bad, but most are helpful to others. Since the 1990s, Steven has been engaged with Python, crafting an array of indispensable tools and applications. His profound expertise has led him to contribute significantly to Packt Publishing, penning notable titles like "Mastering Object-Oriented," "The Modern Python Cookbook," and "Functional Python Programming." A self-proclaimed technomad, Steven's unconventional lifestyle sees him residing on a boat, often anchored along the vibrant east coast of the US. He tries to live by the words “Don't come home until you have a story.”
Read more about Steven F. Lott

View More author details
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Writing a regular expression for parsing

The logs look complex. Here's a sample line from a log:

109.128.44.217 - - [31/May/2015:22:55:59 -0400] "GET / HTTP/1.1" 200 14376 "-" "Mozilla/5.0 (iPad; CPU OS 8_1_2 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B440 Safari/600.1.4"

How can we pick this apart? Python offers us regular expressions as a way to describe (and parse) this string of characters.

We write a regular expression as a way of defining a set of strings. The set can be very small and have only a single string in it, or the set can be large and describe an infinite number of related strings. We have two issues that we have to overcome: how do we specify infinite sets? How can we separate those characters that help specify a rule from characters that just mean themselves?

For example, we might write a regular expression like aabr. This specifies a set that contains a single string. This regular expression looks like the mathematical expression a×a×b×r that...

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Python for Secret Agents - Volume II - Second Edition
Published in: Dec 2015Publisher: ISBN-13: 9781785283406
© 2015 Packt Publishing Limited All Rights Reserved

Authors (2)

author image
Steven F. Lott

Steven Lott has been programming since computers were large, expensive, and rare. Working for decades in high tech has given him exposure to a lot of ideas and techniques, some bad, but most are helpful to others. Since the 1990s, Steven has been engaged with Python, crafting an array of indispensable tools and applications. His profound expertise has led him to contribute significantly to Packt Publishing, penning notable titles like "Mastering Object-Oriented," "The Modern Python Cookbook," and "Functional Python Programming." A self-proclaimed technomad, Steven's unconventional lifestyle sees him residing on a boat, often anchored along the vibrant east coast of the US. He tries to live by the words “Don't come home until you have a story.”
Read more about Steven F. Lott

author image
Steven F. Lott

Steven Lott has been programming since computers were large, expensive, and rare. Working for decades in high tech has given him exposure to a lot of ideas and techniques, some bad, but most are helpful to others. Since the 1990s, Steven has been engaged with Python, crafting an array of indispensable tools and applications. His profound expertise has led him to contribute significantly to Packt Publishing, penning notable titles like "Mastering Object-Oriented," "The Modern Python Cookbook," and "Functional Python Programming." A self-proclaimed technomad, Steven's unconventional lifestyle sees him residing on a boat, often anchored along the vibrant east coast of the US. He tries to live by the words “Don't come home until you have a story.”
Read more about Steven F. Lott

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