The Repeat( s, n ) command catenates the string s with itself n times. If either $n=0$ or $s=''''$, then the empty string $''''$ is returned.

The Repeat command implements the powering operation in the free monoid generated by the nonzero bytes.

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.

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

$\mathrm{Repeat}\left(''abc''\,0\right)$

$\mathrm{Repeat}\left(''abc''\,5\right)$

$''abcabcabcabcabc''$

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

$\mathrm{Repeat}\left(''''\,0\right)$