Module predicates

Simple predicates for characters.

This module contains some useful functions in order to analize ASCII and Unicode characters.

A lot of predicates already available for char type are not included here, even if they are quite useful.

Here an incomplete list of other predicates defined as char associate functions:

• is_alphabetic,
• is_ascii_digit,
• is_numeric,
• is_alphanumeric,
• is_ascii,
• is_whitespace,
• is_ascii_graphic (printable ASCII characters),
• is_ascii_punctuation.

Functions

is_lu_letter

Unicode lowercase/uppercase letter

is_newline

Tests if a character is a newline character (U+000A, \n). Carriage return (U+000D, \r) is not detected by this function because it is usually followed by the newline character.