Regular Expression Examples

# Regular Expression Example
# \d matches only digits

# This code will only match the first digits it finds and stop after that
"abcd345fhbfhnfrj123" -match "\d+"

# This code will match the all digits
"abcd345fhbfhnfrj123" -match "(\d+)"

# Using the regular expressions will always populate the $Matches variable
$Matches

# Matching an email address
"first.lastname@company.com" -match "([a-z]+)\.[a-z]+@[a-z]+\.com"

# Match only letters
"abcdefghijkmnopqrstuvwxyz0123456789" -match "\w+[^\d]"

# Parse Log Files and return the files with a specific IP (-SimpleMatch Parameter treats the string as non regex query)
Get-Childitem -Recurse -Include *.log | select-string -Pattern "10.211.55.30" -SimpleMatch -List

# Parse Log Files and return the files with a specific IP (RegEX)
Get-Childitem -Recurse -Include *.log | select-string -Pattern "\s(\d{1,3})\."