0x200x7E

0x200x7E is a compact notation used to refer to the range of hexadecimal values from 0x20 to 0x7E inclusive. This range corresponds to the printable portion of the ASCII character set in the 7-bit encoding that underlies ASCII.

In ASCII, code points from 0x00 to 0x1F and 0x7F are control characters, used for device control and formatting. The range 0x20–0x7E represents printable characters, including spaces, digits, letters, and punctuation. Specifically, it contains space (0x20), digits (0x30–0x39), uppercase letters (0x41–0x5A), lowercase letters (0x61–0x7A), and punctuation marks such as 0x21 (!), 0x2D (-), 0x2F (/), 0x3A (:), 0x3F (?), 0x5F (_), and 0x7E (~). The total number of characters in this range is 95.

These code points are also part of the Unicode Basic Latin block, and in UTF-8 they are encoded as a single byte identical to their ASCII value. Because they are ASCII-compatible, the 0x20–0x7E range is widely used in contexts involving text portability, such as plain-text processing, terminal displays, and programming environments that assume ASCII-compatible input.

Applications and considerations include input validation to ensure only printable characters are accepted, constructing regular expressions or character classes that restrict to this range, and ensuring compatibility across systems that rely on ASCII-derived encodings.

See also: ASCII, Unicode, UTF-8, printable character range.