Find the string from the cell array

2015 8 12
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更新时间：2015 8 12
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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

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Azzi Abdelmalek
Azzi Abdelmalek 2015-8-12
编辑：Azzi Abdelmalek 2015-8-12

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

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