Search multiple files output matching lines to new file

[Moloch]

Hi,
I am trying to find a way to utilise the full potential of my cpu cores and memory on my windows machine.

Now, I am quite familiar with grep, however, running a Unix based OS is not an option right now.

Unfortunately, the 32 bit grep for windows that I am running, I cannot run multiple instances of it or use the full potential.

Therefore I am trying to create a Perl script using Perl x64 can do the following grep:

grep -h %search_string% *.txt > retuned_Results.sl

Now, I am having troubles with opening multiple files, one at a time and printing out the line matching the search string.

Any pointers on how I should continue would be greatly appreciated.

Thanks for your assistance.