Get all lines containing a string in a huge text file - as fast as possible?

Question

In Powershell, how to read and get as fast as possible the last line (or all the lines) which contains a specific string in a huge text file (about 200000 lines / 30 MBytes) ?

Answer 1

Have you tried using [System.IO.File]::ReadAllLines();? This method is more "raw" than the PowerShell-esque method, since we're plugging directly into the Microsoft .NET Framework types.

$Lines = [System.IO.File]::ReadAllLines();
[Regex]::Matches($Lines, 'my_string_pattern');