MATLAB: Regexprep does not exactly what I want

regexprep

Dear all,
I have the following cell array
Charge = {'OH-1'}    {'KOH+0'}    {'K+1'}    {'I-1'}    {'HI+0'}    {'H3O+1'}    {'H2O+0'}
I want to remove all information before the + and – signs. Therefore I tried the following:
regexprep(Charge,'[^-+].','');
which produces 
{'-1'}    {'0'}    {'1'}    {'1'}    {'+0'}    {'1'}    {'0'}
This works well except in case of only one character in front of the minus sign (i.e. in case of I-1). In that case, the – sign is also deleted. The – signs are crucial to be included, the + signs not.
Any suggestions?
Thanks, Tim

Best Answer

There's definitely a way to do it using regexprep, but I found this solution first, so hopefully it is sufficient.
Charge = {'OH-1','KOH+0','K+1','I-1','HI+0','H3O+1','H2O+0'};
c = regexp(Charge,'[-+]\w*','match');
cc = cat(2,c{:}); % put back into cell array
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