Select-String

Below are some quick commands to search for urls, domains, emails, ipv4 addresses and specific file extensions using Powershell Select-String.

Data Type	PowerShell Command Example	Description
HTTP/HTTPS URLs	Select-String -Path file.txt -Pattern 'https?://\S+' -AllMatches | % {$_.Matches} | % {$_.Value}	Extracts URLs case-insensitively (PowerShell regex is case-insensitive by default).
Domains	Select-String -Path file.txt -Pattern '([a-zA-Z0-9-]+\.)+[a-zA-Z]{2,}' -AllMatches | % {$_.Matches} | % {$_.Value}	Extracts domain names.
Email Addresses	Select-String -Path file.txt -Pattern '[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}' -AllMatches | % {$_.Matches} | % {$_.Value}	Extracts email addresses.
IPv4 Addresses	Select-String -Path file.txt -Pattern '\b([0-9]{1,3}\.){3}[0-9]{1,3}\b' -AllMatches | % {$_.Matches} | % {$_.Value}	Extracts standard IPv4 addresses.
Given File Extension	Select-String -Path file.txt -Pattern '\S+\.(exe|ps1)' -AllMatches | % {$_.Matches} | % {$_.Value}	Extracts filenames ending in specific extensions.

Tip: In PowerShell, Select-String regex matching is case-insensitive by default, and -AllMatches combined with the pipeline expansion extracts just the matched substrings similar to grep -o.