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The HasControlCharacter( s ) command determines whether s contains a control character.

If s contains a control character, HasControlCharacter returns true. Otherwise, false is returned.

Note: A control character is a special non-printing character that is defined by the character set to which it belongs. For more information about control characters in Maple, see backslash .

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.

The StringTools[HasControlCharacter] command is thread-safe as of Maple 15.

For more information on thread safety, see index/threadsafe .

$\mathrm{with}\left(\mathrm{StringTools}\right)\:$

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

$\mathrm{length}\left(s\right)$

$255$

$\mathrm{HasControlCharacter}\left(s\right)$

$\mathrm{true}$