Is it possible to specify a safe zone in regular expressions?

Question

Regular Expressions

Good day.
Tell me, is it possible to specify a "safe zone" in C# in regular expressions, i.e. so that Regexp does not work in this zone (for example, between two arbitrary characters).
I'll give you an example.
I have a string '2+'+'3=5', it needs to be divided by pluses, but only so that the pluses in apostrophes remain there, i.e. as a result, you need an array of three elements (two parts of the string and one separator):
'2+'
+
'3=5'
First of all, the Regexp solution is of interest, but if there are alternatives, except for passing through the string and comparing, then please share.

Answer 1

Here's how I got it

foreach(var substring in Regex.Split("'2+'+'3=5'", @"'\+'").Select(s => s.Trim('\'')))
      Console.WriteLine(substring);

Result

2+
3=5

http://rextester.com/live/HMK89782