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Delphi strings use single quotes, for example 'a valid string'. How does one specify the ' character within a literal string? How would one refer to the null byte (Unicode code point U+0000)?
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To insert characters that are illegal in a string, use an escape character. An escape character is a backslash \ followed by the character you want to insert.
In you simple language where all variables are single letters, a " replacement pattern" might simply be a $ followed by a character. Once you find the pattern, you then figure out which variable to replace it with. After the replacement, you carry on with the rest of the template string.
Escape characters. Escape characters are used to remove the special meaning from a single character. A non-quoted backslash, \, is used as an escape character in Bash. It preserves the literal value of the next character that follows, with the exception of newline.
To add a single quote to a string, you include two ' marks e.g.
str := '''test string'''; Writeln(str) In the string above, you have the normal single quotation to start a string and then two for the single quote. Same goes for the end of the string.
You can also use # followed by a number for other escape character e.g.
For a new line:
str := 'Newline' + #13 + #10 or just
str := 'Newline'#13#10 Of course, using the platform-dependent constant for newline is better.
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To answer the last part of the question, you can use
#$0000 To add U+0000
This way you can add the other Unicode chars too. (Be sure to use a font that can display those characters.)
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