How to write regular expression in powershell?

@deron 

In PowerShell, you can use the -match operator to apply a regular expression pattern to a string. Here is an example of how to write a regular expression in PowerShell:

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# Define a regular expression pattern
$pattern = "^[A-Za-z]+$"

# Define a string to match against
$string = "Hello123"

# Use the -match operator to apply the regular expression pattern
if ($string -match $pattern) {
    Write-Host "String matches the pattern"
} else {
    Write-Host "String does not match the pattern"
}

In this example, the regular expression pattern ^[A-Za-z]+$ matches any string that consists only of alphabetic characters. The -match operator returns $true if the string matches the pattern, and $false if it does not. You can customize the regular expression pattern according to your specific requirements.