XLISP alphanumericp

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# alphanumericp

Type: | - | predicate function (subr)
Source: | - | xlstr.c

## Syntax

(alphanumericp char)
  char - a character expression
  returns - T if the character is alphabetic or a digit, NIL otherwise

## Description

The 'alphanumericp' function checks if the 'char' expression is an alphabetic or a digit character. If 'char' is an alphabetic [either an upper or lower case] or a digit character, T is returned, otherwise NIL is returned. Note that XLISP is limited to ASCII characters, so there is no way to find out if an Unicode character with a char-code greater than ASCII 127 is alphanumeric or not.

## Examples

    (alphanumericp #\A)  => T
    (alphanumericp #\a)  => T
    (alphanumericp #\1)  => T
    (alphanumericp #\[)  => NIL

See also:

- Contents → Character Functions

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Nyquist / XLISP 2.0 - Contents | Tutorials | Examples | Reference