OK so what is the regex to capture the piece of text that starts with space and ends with the end of the line and can contain any character?

-kalos (June 07, 2020, 08:22 AM)

That would look like this:
What this does is:
.* : Any character
\s+ : white-space, 1 or more consecutive
(  : start group
\S+  : not white-space, 1 or more consecutive
)  : end group
$  : end of line marker

You will have to get the group 1 value for your result, input like this:
will give you the word 'line' as a result

If you are still searching for your original request, I took the first regex from https://emailregex.com, dropped it in the https://regex101.com regex tester, fixed the issues it reported (escape a few slashes because of the PCRE regex engine), and wrapped it with the construction I just showed here, and came up with this:
If you feed that this text:
The only group that's there produces '[email protected]' as a result.

Did I complete your assignment with this? ;)

First thing I'd do is switch to Firefox, when having that many tabs open in a browser, Chrome isn't really good at that, consuming lots of memory and CPU when the tab-count goes up. I'm running one of my Firefox instances with 300 tabs, without trouble, but I do turn off that computer at the end of my workday.

I try to never touch the pagefile size, at least not since the Windows 2000 days, back in the Windows NT 4.0 days it seemed to make sense to tune it, but after that it usually got worst whatever way I tuned it away from the Windows optimal/automatic settings. Theoretically, Windows running on a 16 GB system should be able to do without any pagefile, but I've found that Windows can get really instable that way, so that's IMHO a good reason not to touch it.

Why are you trying to use something you don't know how to construct (you are not even checking for the mandatory @ and .  >:(), if there are several working examples and links in posts above yours? Please use the advice that's given, for free, by ppl that actually know what they are talking about.