Escaping special characters inside a Delphi string literal

A string can contain a single quote by doubling the ' character, for example

messageText := '''sample text''';
Writeln(messageText)

Here the first single quote opens the string, followed by a pair representing one quote. The ending uses the same arrangement.

Other escape characters can be written with # and a number, for instance

For a line break:

messageText := 'Line break' + #13 + #10

or simply

messageText := 'Line break'#13#10

Naturally, the platform-specific newline constant is the preferable choice.

Write the ' character twice. For instance: 'Isn''t'. Write a null byte as #0.

For the question's final part, the following can be used

#$0000

To insert U+0000

Other Unicode characters can be inserted this way as well. (Make sure your font supports displaying the characters involved.)