How to batch rename files with a regex?

Question

Regular Expressions

Hello. There is a folder with 10k files of this type:
7a7000063f8630027d3ab736563726574_query=%D0%9C%D0%B0%D1%80%D0%BA%D0%B5%D1%82%D0%BE%D0%BB%D0%BE%D0%B3 .html
How to convert all files inside a folder to the format
7a7000063f8630027d3ab736563726574.html
Thank you

Answer 1

With the help of "Total Commander"
Check the box for regular expressions
and use the regular expression:
with the replacement for
click "Run"