Cannot define a raw string literal ending in double-quote

[weitzhandler]

Version Used:
12

Steps to Reproduce:

Try to create a raw string literal of the following regex pattern ending in " or \":

Diagnostic Id:

• https://dotnetfiddle.net/r8nzL5 (tried sharplab.io but it failed to save).
• https://regexr.com/80oti

Expected Behavior:
Should try to match the number of quotes both beginning to end (and perhaps vice versa), searching from end of string as well. This way, when the literal terminates in 3 dbl-quotes, even preceeded by another one will still compile.

Actual Behavior:
Doesn't compile.

[CyrusNajmabadi]

This is by design. Single line raw-strings cannot start or end with a ". You need to use a multi-line literal for that.

You need to write it like so: https://sharplab.io/#v2:EYLgtghglgdgNAFxFANgHwAICYCMBYAKAEgSTCMBmAAmxpwHZCBvQo7LVl4ogeh6oAqAJwCesAOZUEAeyoBjIQFMICRVIAWUAM5UASovGKAHlQAOK1UJhUA7lATqqEKkIg26ABiop7i1ylZefnUEBFMtED4lQyMhADo5aTAeAA4PaQQoQMC+KgBVLQkNJTUARwBXDMUtQIA3CCFixUUARUrVHQBeKgAiPsIqQaHhwYAdTtGegAoAbQgAWgAvAF0AagBKSYGRnb6egG4ybiI6hqoAM2lyoTaqrt697Z3h8cnZhZWNrYJnkb2D1gAX0IgKAA==

using System;
					
public class Program
{
	public static void Main()
	{
		// Trying to create this Regex pattern with a raw string literal
		// https://regexr.com/80oti
		
		// Using three quotes
		var threeQuotes = """
            \=\"([a-z]+)\"
            """;		
			
		var fourQuotes = """"
            \=\"([a-z]+)\"
            """";
	}
}