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 .