Repeats a string value.
function replicates and concatenates a string multiple times. The number of repetitions is specified by the repeats
argument. The repeats
argument specifies the number of repeats as a positive integer. If repeats
is a decimal number, it is truncated to an integer. The repeats
string is parsed as an integer until a non-numeric character is encountered. Thus 7dwarves is parsed as 7. If repeats
is 0, a negative number, or a non-numeric string, STR
returns a null string.