Subject: bug#40634: Massive pattern list handling with -E format seems very slow since 2.28.

From: [email-masked]
Date: Mon, 20 Apr 2020 17:44:14 +0900 (JST)

Hi, 

I immediately tried the attached patch, and was able
to confirmthat grep perfomance is improved.

Our work to find thousands of patterns in a file with
tens of thousand lines is going extremely smoothly.

I'm glad for your quick response.

Thank you.