endsWith.m: overhaul function. * endsWith.m: Use @group within @example blocks in documentation. Clarify docstring text. Add regexp, strncmp, strncmpi to @seealso reference. Combine input validation in to smaller code blocks. Eliminate try/catch block by using isreal() test. Use cellfun() rather than for loop with flip() to reverse STR and PATTERN. Declare retval to be of logical type rather than double type. Update BIST tests.