Multi-line find and replace in project

[solomonkinard]

The ability to find and replace multiple lines would be epic!
#397 is different from #396 because it is requesting multiple rows in both the find and replace fields.
#396 only accounts for the insertion of a newline character in the replace field.

[benogle]

Is this for buffer find or project find?

[solomonkinard]

It could be useful in both, so feel free to choose the easiest one to implement (e.g. buffer).

[dschwen]

This already works in buffer find (with regular expressions containing \n), however it does not seem to work in project find.

[TW80000]

Just a heads up for anyone that might run into the same problems I did:

1. On Windows newlines are denoted by \r\n, not just \n like on unix-like systems. You'll need this for multi-line regex find expressions.
2. If you use the $ character in a regex followed by your \n or \r\n, you'll be able to highlight text that matches the regex, but the replace will fail (in my experience). Taking out the $ will allow you to do the replace.

[mik01aj]

+1.

Related: https://discuss.atom.io/t/multi-line-find-and-replace/10222

[50Wliu]

At this point there isn't any constructive feedback happening, and each +1 notifies 56+ people, so I'm locking this issue. We will comment here as updates occur. As usual, PRs are welcomed for this issue.