The Delete(s,rng) command removes a segment of a string s, specified by the second argument rng.

The range argument rng must specify a valid range of characters in the string s, unless the string s is empty. If s is the empty string, then the empty string is returned in all cases, no matter how the range is specified.

When the endpoints of rng are equal, a single character of the non-empty string s is removed.

Note that Delete( s, 1 .. length( s ) ) (or, equivalently, Delete( s, 1 .. -1 )) returns the empty string $''''$.

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.

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

$\mathrm{Delete}\left(''abcde''\,2..3\right)$

$''ade''$

$\mathrm{Delete}\left(''abcde''\,4..4\right)$

$''abce''$

$\mathrm{Delete}\left(''abcde''\,2..-2\right)$

$''ae''$

$\mathrm{Delete}\left(''abcde''\,2..7\right)$

$''a''$

$\mathrm{Delete}\left(''''\,1..-1\right)$

$\mathrm{Delete}\left(''''\,98..43\right)$

$\mathrm{Delete}\left(''''\,5..5\right)$