Book Image

Mastering Windows PowerShell Scripting (Second Edition) - Second Edition

By : Brenton J.W. Blawat
Book Image

Mastering Windows PowerShell Scripting (Second Edition) - Second Edition

By: Brenton J.W. Blawat

Overview of this book

PowerShell scripts offer a handy way to automate various chores. Working with these scripts effectively can be a difficult task. This comprehensive guide starts from scratch and covers advanced-level topics to make you a PowerShell expert. The first module, PowerShell Fundamentals, begins with new features, installing PowerShell on Linux, working with parameters and objects, and also how you can work with .NET classes from within PowerShell. In the next module, you’ll see how to efficiently manage large amounts of data and interact with other services using PowerShell. You’ll be able to make the most of PowerShell’s powerful automation feature, where you will have different methods to parse and manipulate data, regular expressions, and WMI. After automation, you will enter the Extending PowerShell module, which covers topics such as asynchronous processing and, creating modules. The final step is to secure your PowerShell, so you will land in the last module, Securing and Debugging PowerShell, which covers PowerShell execution policies, error handling techniques, and testing. By the end of the book, you will be an expert in using the PowerShell language.
Table of Contents (24 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Regular-expression-based operators


Regular expressions are an advanced form of pattern matching. In PowerShell, a number of operators have direct support for regular expressions. Regular expressions themselves are covered in greater detail in Chapter 10, Regular Expressions.

The following operators use regular expressions:

  • Match: -match
  • Not match: -notmatch
  • Replace: -replace
  • Split: -split

Match and not match

The -match and -notmatch operators return true or false when testing strings:

'The cow jumped over the moon' -match 'cow'  # Returns true 
'The       cow' -match 'The +cow'            # Returns true 

In the preceding example, the + symbol is reserved; it indicates that The is followed by one or more spaces before cow.

Note

Match is a comparison operator: Like the other comparison operators, if match is used against an array, it returns each matching element instead of true or false. The following comparison will return the values one and three:"one", "two", "three" -match 'e'

In addition to returning...