Ytdyklly

I find all needed files with grep: grep --include=*.{php,ini,conf,sh} -ril -P "'([dw-_.]+)(@domain.com)'" '/var/www_data/somepath/'

Now I assume it's either use of sed or perl to for replacement process, alas I can't figure out how to use above regexp in either of them.
I saw this way and this way but as I said, I couldn't get it work with my pattern (and by that I mean that I get > in the next line after executing command. I assume it's problem with regexp shown above when used with sed or perl), so any advice on that matter would be nice.

Also, I don't know if it's possible (it's not really important) but I'd like to print some string for each file in with replacement occurred, for example File fixed: /path/to/file/ (file names taken from grep list maybe?)

Typically, when you get a > in the next line after hitting, it means that one of your quotes isn't closed yet. I couldn't find that mistake in your regex. But you do not need to surround the path /var/www_data/somepath/ with single quotes. I assume there are no unusual characters in somepath?

Anyways, I tested your regex with sed. dw look like vim syntax for me, that's why I translated it to ascii (which always works). Also, inside of you do not need to escape .:

sed -r "s/'([A-Za-z0-9_-.]+)(@domain.com)'/'adsf'/g" test.dat

Indeed you can use sed or perl for your task. You don't necessarily need grep to generate a file list, unless you have GB of data. Then presorting could result in a speed benefit.

To test your regex, you could do the following:

cd /var/www_data/somepath/

sed -r 's|pattern|replace-pattern|g' a_single_file.php

When you're satisfied with the result, just add the -ibak (--in-place=bak) argument and run it on all files

find . -type f -name '*.php' -o -name '*.ini' -o name '*.conf' -o -name '*.sh' 

-exec sed -r -ibak 's|pattern|replace-pattern|g' '{}' ; 

The original files are being put into <orignalname.php>.bak.

To answer your last question. For this job, grep is the tool you want, you could run it on the .bak files generated by sed above:

grep --recursive --include='*.bak' -E --files-with-matches 'pattern' . > files_fixed.txt

or, simply:

find . -type f -name '*.bak'

With GNU sed you can use sed -i.

sed -i 'script' *.{php,ini,conf,sh}

Most Linux:

sed -i 's#FIND#REPLACE#g' *.{php,ini,conf,sh}

On MacOS:

sed -i '' 's#FIND#REPLACE#g' *.{php,ini,conf,sh}

The sed in MacOS is expecting a backup parameter after -i, use empty string if you don't need backup files. The "g" is for global replace, otherwise it's only the first per row.