In JMP you can specify a newline and tab like this:
newline = "\!n";
tab = "\!t";
a = evalinsert("Hello World^tab^Again^newline^Fubar^tab^Again");
Use the substitute command to replace your character strings with newline or tab.
newline = "\!n";
tab = "\!t";
a = "AB</>CDEFG<->HIJK</>LMNOP<->QRSTU</>VWXYZ";
b = substitute(a, "</>", tab);
c = substitute(b, "<->", newline);
write(c);
Output:
AB CDEFG
HIJK LMNOP
QRSTU VWXYZ