Parse Text Data

Identify Similar String Patterns you own this product

This project is part of the liveProject series Parse Text Data with PowerShell
intermediate PowerShell (use variables, common PowerShell built-in cmdlets, conditional and loop statements)
skills learned
read text files • use complex regex patterns including lookaround, regex quantifiers, and ranges • use the switch statement and its regex parameter to extract substrings from text files • arrays and array indexing using expressions • edit text using replace operations • write to text files
Fernando Corrales
1 week · 4-6 hours per week · INTERMEDIATE

placing your order...

Don't refresh or navigate away from the page.
liveProject This project is part of the liveProject series Parse Text Data with PowerShell liveProjects give you the opportunity to learn new skills by completing real-world challenges in your local development environment. Solve practical problems, write working code, and analyze real data—with liveProject, you learn by doing. These self-paced projects also come with full liveBook access to select books for 90 days plus permanent access to other select Manning products. $19.99 $29.99 you save $10 (33%)
Identify Similar String Patterns (liveProject) added to cart
continue shopping
adding to cart

choose your plan


only $41.67 per month
  • five seats for your team
  • access to all Manning books, MEAPs, liveVideos, liveProjects, and audiobooks!
  • choose another free eBook every time you renew
  • choose twelve free eBooks per year
  • exclusive 50% discount on all purchases
  • Identify Similar String Patterns eBook for free
Look inside

XYZ Services Company, the consulting and outsourcing firm you work for, recently experienced a massive failure in its IT Infrastructure. While it’s working on getting the environment back up and running, the company urgently needs to identify potential vulnerabilities in the digital signatures used by the employees for two-factor authentication. Applying PowerShell scripting best practices, you’ll write a script that uses the switch statement and its regex parameter to extract a list of digital signatures from an input file, identify matching strings that satisfy specific conditions, classify them as required, and send them to log files. When you’re done, the information security officer will thank you for helping prevent future security issues.

This project is designed for learning purposes and is not a complete, production-ready application or solution.

book resources

When you start your liveProject, you get full access to the following books for 90 days.

project author

Fernando Corrales
Fernando Corrales is a cloud engineer with several years of IT experience in multinational companies. He’s worked extensively with VMware products, focusing on private cloud automation with PowerCLI and PowerShell, in addition to delivering PowerShell training for some of his recent employers. Fernando holds several technical degrees from the Tecnológico de Costa Rica and has a personal blog:


This liveProject is for technology administrators and intermediate-level PowerShell users who want to learn or expand their text and string parsing skills. To begin these liveProjects you’ll need to be familiar with the following:

  • Intermediate PowerShell 7
  • Visual Studio Code with PowerShell extension

you will learn

In this liveProject, you’ll learn how to use the switch statement and its regex parameter and how to write regular expression patterns to find strings that satisfy specified conditions.

  • Extract a list of values using the Select-String cmdlet to further analyze each match using a switch construct
  • Use the Select-String cmdlet to find regex matches and write the matching values to a file
  • Work with advanced regular expressions, including negative lookbehind, negative lookahead, quantifiers, alternation and ranges
  • Use the replace operator to modify text strings
  • Use the cnotmatch operator to find strings that don't match specified regex patterns
  • Get property values using the dot method
  • Work with arrays and array indexes
  • Use the Get-Date cmdlet to generate strings in date and/or time format
  • Read and write text to a file using PowerShell
  • Display objects on the screen


You choose the schedule and decide how much time to invest as you build your project.
Project roadmap
Each project is divided into several achievable steps.
Get Help
While within the liveProject platform, get help from other participants and our expert mentors.
Compare with others
For each step, compare your deliverable to the solutions by the author and other participants.
book resources
Get full access to select books for 90 days. Permanent access to excerpts from Manning products are also included, as well as references to other resources.