Mark files whose name starts by a given prefix

Question

I'm using Dired+. In folder1 I have 200 files. 30 files start with 15_02_xxx, 46 files start with 16_02_xxx and the rest have other names.

I want to copy from folder folder1 to folder2 only files whose names start with 15_02_xxx or 16_02_xxx. So the total number of marked files must be 76. So how in Dired mode I can select only the desire files?

Emacs 26.1, Windows 10, Dired+

Answer 1

Type % m ^1[5-6]_02_ RET

% m runs the command dired-mark-files-regexp, the regular expression matches anything that starts with either 15_02_ or 16_02_.