The HasLower(s) command determines whether s has a lowercase letter. A character is lowercase if it is one of the following:

If s has at least one lowercase letter, then HasLower returns true. Otherwise, false is returned.

The HasUpper(s) command determines whether s has an uppercase letter. A character is uppercase if it is one of the following:

If s has at least one uppercase letter, then HasUpper returns true. Otherwise, false is returned.

The HasAlpha(s) command determines whether s has an alphabetic character. A character is alphabetic if it is either upper or lowercase.

If s has at least one alphabetic character, HasAlpha 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[HasLower], StringTools[HasUpper] and StringTools[HasAlpha] commands are thread-safe as of Maple 15.

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

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

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

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

$255$

$s≔\mathrm{Random}\left(30\,'\mathrm{lower}'\right)$

$s≔''yhcmxxkyzmifmmfydhnlfmoslddhns''$

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

$\mathrm{false}$

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

$\mathrm{true}$

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

$\mathrm{true}$

$t≔\mathrm{Random}\left(30\,'\mathrm{alnum}'\right)$

$t≔''AHuTpQa5C8T6ha3urQ3tAsG3hZpFYs''$

$\mathrm{HasUpper}\left(t\right)$

$\mathrm{true}$

$\mathrm{HasLower}\left(t\right)$

$\mathrm{true}$

$\mathrm{HasAlpha}\left(t\right)$

$\mathrm{true}$

$u≔\mathrm{Random}\left(30\,'\mathrm{digit}'\right)$

$u≔''394898792561495559420320378405''$

$\mathrm{HasUpper}\left(u\right)$

$\mathrm{false}$

$\mathrm{HasLower}\left(u\right)$

$\mathrm{false}$

$\mathrm{HasAlpha}\left(u\right)$

$\mathrm{false}$