Powershell 2 freezing on Select-String ".*_.*=-1"

Question

this might seem like stupid Q but I have PS problem: like the title says I try something like:

 $all = gci D:\work\
 $all | Select-String ".*_.*=-1"

(im looking for config option that has value -1 and _ in name) Problem is that PS freezes, aka it doesnt finish in reasonable time, ctrl +c doesnt work. Ofc you could say that data is just to much for it to process, but problem is that grep takes like 1-2 secs on same folder and same regex.

Grep command is (originally it didnt have -r but I added it after some comments, grep is still fast but it takes 20-30 sec)

grep ".*_.*=-1" -r D:\work\*

EDIT:

$all  | ForEach-Object {echo $_.Name;  $_|Select-String ".*_.*=-1"      }

shows slowly filenames... I guess the problem is that Regex speed in PS is pathetic...

Answer 1

Specific:
Try tweaking a regex to

 [^_]*_[^=]*=-1

equivalent grep version :

grep -P '[^_]*_[^=]*=-1'

General:
The regex implementations are different, so that is the reason for different behavior. I don't know specifics of powershell regex implementation, so I don't know the exact reason.