Powershell Regex find emails and replace email with (<email>)

Question

I am trying to search a .eml file for all emails and add <> brackets between each email found, here's the code I have, it outputs what should happen but it does not write to the file. Note, I need to keep the existing data in the file (Title, body,etc.), only replacing the email address.

$rawtext = [IO.File]::ReadAllText("c:\scripts\emailex.eml")
$regex = [regex]"(?i)\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b" 
$regex.Matches($rawtext) | ForEach-Object{ $_ -replace $($_.Value), "<$_>" }

What exactly is your question/issue? Is it that it isn't writing to the file? You have nothing in your code that writes to a file. — Edward Eisenhart
– Edward Eisenhart, Commented Jan 14, 2015 at 20:24
I am aware it does not write to the file but I am looking for help in how TO write it to file. When trying to write to a file it would always write the whole line instead of just the email for me. — scrypto
– scrypto, Commented Jan 15, 2015 at 2:44

Edward Eisenhart · Accepted Answer · 2015-01-14 20:54:24Z

0

I am not convinced that your email Regex is fully robust, but you are only reading the file and not writing back to it.

I recommend using Get-Content and Set-Content and using piping to link everything together. Although this could get slow and memory intensive for very large files.

Something like:

(Get-Content C:\test\test.txt) | 
Foreach-Object {$_ -replace "(?i)\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b",'<$0>'} | 
Set-Content C:\test\test.txt

Running the above Powershell turns the textfile C\test\test.txt from:

Hi my email is [email protected]
I like to email [email protected]

into

Hi my email is <[email protected]>
I like to email <[email protected]>

answered Jan 14, 2015 at 20:54

Edward Eisenhart

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3 Comments

scrypto Over a year ago

Thanks, I will check this out as soon as I can, I was over thinking it and the files won't be very large anyhow.

scrypto Over a year ago

Thanks Edward, seems to be working as you mentioned. How hard would it be to check for existing emails that contain <> and exclude them from the replace? What would I have to add? IF, ELSE?

Edward Eisenhart Over a year ago

You could do two passes. The first replaces ALL emails and the second changes << and >> to singles. If your Regex engine supports look ahead and look behinds you could use those as well. Which I am pretty certain the replace does. See if (?i)(?<![\w<])[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}(?![\w>]) works for you. See regex101.com/r/kL1oR8/1

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