IS_ASCII

IS_ASCII is used to test if a string contains only ASCII characters.

Syntax

IS_ASCII( expr ) --> BOOL

Arguments

Parameter	Description
`expr`	A general value expression or a literal to test.

Returns

Returns TRUE when expr contains only ASCII characters (0-127) or FALSE otherwise.

Notes

If the expression to test is NULL, IS_ASCII returns NULL.

Examples

For these examples, consider the following table and contents:

CREATE TABLE dictionary (id INT NOT NULL, text TEXT);
INSERT INTO dictionary VALUES (1, '行こう'), (2, '乾杯'), (3, 'L''chaim');
SELECT id, text, IS_ASCII(text) FROM dictionary;

IS NULL

id | text     | is_ascii
---+----------+----------+---------
 1 | 行こう    | false
 2 | 乾杯      | false
 3 | L'chaim   | true