How do I save all of the workspace variables except for a certain specified variable under a specified name?

I got an example from http://www.mathworks.co.uk/support/solutions/en/data/1-F4WH7N/index.html?product=SL&solution=1-F4WH7N:

>> clear;

>> a = 3; b = 4; c = 5; d = 6;

>> save test -regexp ^(?!(a|d)$).

however, I would like to save the workspace as 'filename2.mat', which is the second string in a cell array E, i.e. E=[filename1, filename2, filename3];

because it would be used in a loop ,so I cannot specify the name as 'filename2.mat'.

BTW, neither those codes would work:

filename=char(E(2));

save (filename -regexp ^(?!(a|d)$).)

save (filename,-regexp ^(?!(a|d)$).)

save (filename) -regexp ^(?!(a|d)$).

Anyone could help? Thanks!

Answer 1

[per isakson]

Try

    save( filename, '-regexp', '^(?!(a|d)$).' )

the values of the arguments should be strings