_CP_replace is equivalent to the result = replace(string1, ac.expression, vc.expression, sc.expression, string2) BASIC statement.
int _CP_replace(CPSTR** result, CPSTR* string1, int ac.expression, int vc.expression, int sc.expression, CPSTR* string2)
This function returns -1 if an error occurs. The error code is contained in _CP_errno.
/* Prints "c^b". */
CPSTR * s = _CP_mkstr("a\376b");
CPSTR * t = _CP_mkstr("c");
_CP_replace(&s,s,1,0,0,t);
_CP_print(s);