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Have your test_enc like this:
#!/bin/sh
openssl enc -d -aes-256-cbc -a -in bb -pass pass:test123 | sh -s "$@"

I am sorry to say that it's almost impossible to "teach" you regular expressions and patterns therein. This is very much a matter of experience.
Set up a set of a few close but different filenames,...

Yes, and you could even be more specific w.r.t. pattern for date:
Ashish_en_[A-Za-z]+[0-9]{2}_1\.log

You cannot have two quantifiers * and + one after the other. It either has to be * (0 or more occurrences of the previous character) or + (1 or more occurrences of previous character.

Touch two files with the right times and "find ... -type f -newer low_time ! -newer high_time"?

Hello,

use find with time options (-mtime, -ctime, -atime, -cmin ....)
and -exec cp in your cron.