$input_path = "d:\txt\*.txt"
$output_file = 'd:\out.txt'
$regex = "\w* (\w\.? )?\w* (was )?[B|b]orn .{100}"
select-string -Path $input_path -Pattern $regex -AllMatches | % { $_.Matches } | % { $_.Value } > $output_file
Powershell beginner here. I'd like it to loop through all files in a specific directory, search for a specific regex pattern and output the results to a file. So far I've managed to work out the above. How can I have it also output the filename for each match?
You can do the following:
$input_path = "d:\txt\*.txt"
$output_file = 'd:\out.txt'
$regex = "\w* (\w\.? )?\w* (was )?[B|b]orn .{100}"
Select-String -Path $input_path -Pattern $regex -AllMatches | Foreach-Object {
$currentMatches = $_
$_.Matches | Foreach-Object { $_.Value,$currentMatches.Filename -join ' | ' } |
Add-Content $output_file
}
Explanation:
Select-String will return a collection of MatchInfo objects. Each of those objects has a Filename property that contains only the filename of the file containing the match(es). Since there could be multiple matches (due to -AllMatches) in a single file, it is necessary to iterate through each match within a MatchInfo object.
The -join operator joins all items in a collection with a defined string delimiter.
So for your last line, use:
# put matches into var
$matches = Select-String -Path $input_path -Pattern $regex -AllMatches
# write out to file
foreach ($m in $matches) { $m.Filename | Out-File $output_file -Append -NoClobber }
Stphn Lastname was born in 1995 xyz | 1.txt Robot Science was born in 1996 xyz | 2.txt