IsASCII - Maple Help
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StringTools

 IsASCII
 determine if a character is in the ASCII character set

 Calling Sequence IsASCII(char)

Parameters

 char - string; character to test

Description

 • The IsASCII(char) function determines whether char is in the ASCII character set (ASCII code 1 through 127).
 • If char is in the ASCII character set, then IsASCII returns true. Otherwise, false is returned.
 • If char is a string that contains more than one character, then all the characters in the string are tested. The command returns true if the condition is true of all characters in the input string. For the empty string, the tested condition is vacuously true.
 • This procedure is part of the StringTools package, and so it can be used in the form IsASCII(..) only after executing the command with(StringTools).  However, it can always be accessed through the long form of the command by using the form StringTools[IsASCII](..).
 • All of the StringTools package commands treat strings as (null-terminated) sequences of $8$-bit (ASCII) characters.  Thus, there is no support for multibyte character encodings, such as unicode encodings.

Thread Safety

 • The StringTools[IsASCII] command is thread-safe as of Maple 15.
 • For more information on thread safety, see index/threadsafe.

Examples

 > $\mathrm{with}\left(\mathrm{StringTools}\right):$
 > $s≔\mathrm{convert}\left(\left[\mathrm{}\left(1..255\right)\right],'\mathrm{bytes}'\right):$
 > $\mathrm{length}\left(s\right)$
 ${255}$ (1)

Important Note: The user should take care if attempting to copy the following example into a Maple session.  Since the output from the following command contains control characters, unexpected results can occur on certain platforms. It is recommended that this example not be copied.

 > $\mathrm{Select}\left(\mathrm{IsASCII},s\right)$

 "abtnvfre !\#\$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|} "

 See Also