Find the string from the cell array

I have a cell array containg a = {'s_ddfa_af' ; 'adfa' ; 'f_dsfa_dasf_sdf'; 'asdf_dd'};

I need to extract the string starting with 's'

When I use regular expression regexpi( a , 's(\w*)' ,'match')

 I am getting as  {'s_ddfa_af' ; [] ; 'sfa_dasf_sdf' ; 'sdf_dd'}

but i need only the string starting with 's'

How can i do this??

Thanks a lot

Answer 1

[Azzi Abdelmalek]

a = {'s_ddfa_af' ; 'adfa' ; 'f_dsfa_dasf_sdf'; 'asdf_dd'};
out=regexpi(a,'^s\w*','match')