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09-num-escape.mdwn

[[!meta title=“2.9 | Numeric Character Escape Sequences”]]

Numeric Character Escape Sequences

The numeric sequences allow specifying a character value by its Unicode character number (code point). They’re supported by single-quoted character literals and inside string literals.

• \nnnnn - decimal number, prefixed by \. For example, '\97 is the same as 'a'.
• \onnnnn - octal number, prefixed by \o (the letter o, not the number 0). Digits allowed are 0-7. For example, ‘141’is the same as‘a’`.
• \xnnnnn - hexadecimal number, prefixed with \x. Digits allowed are 0-9, a-f (and their uppercase counterparts A-F). For example, '\x61' is the same as 'a'.

The maximal value of a numeric sequence is \1114111, which is the same as \o4177777 and \x10ffff. This is exactly enough to represent all Unicode values.