The HasGraphic(s) command determines whether s has a graphic character. Graphic characters consist of the alphanumeric characters and the punctuation characters. (For more information, see HasAlphaNumeric and HasPunctuation.)

If s has a graphic character, HasGraphic returns true. Otherwise, false is returned.

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[HasGraphic] command is thread-safe as of Maple 15.

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

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

$\mathrm{HasGraphic}\left(\mathrm{Random}\left(100\right)\right)$

$\mathrm{true}$

$\mathrm{HasGraphic}\left(\mathrm{Random}\left(100\,'\mathrm{cntrl}'\right)\right)$

$\mathrm{false}$