How do I parse this string?

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K E
K E 2013-1-30
I would like to parse the following string
a='4:256404:val=9.999e+20:val=1.82:val=2.15:val=2.66:val=2.18:val=1.81';
to obtain the vector x = [9.999e+20 1.82 2.15 2.66 2.18 1.81]. In reality the string is 5308 characters long and there are very many of them. I believe I can't parse this with regexp because I want to separate with a defined sequence ':val='. I could do the following, but is there a cleaner way?
matchThisString = ':val=';
iBreak = findstr(a, matchThisString);
x = NaN*ones(1, (length(iBreak)-1));
for ii = 1:(length(iBreak)-1)
iStart = iBreak(ii) + length(matchThisString);
iEnd = iBreak(ii + 1) - 1;
x(ii) = str2num(a(iStart:iEnd));
end

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Azzi Abdelmalek
Azzi Abdelmalek 2013-1-30
编辑：Azzi Abdelmalek 2013-1-30
a='9.999e+20:val=1.82:val=2.15:val=2.66:val=2.18:val=1.81'
b=str2double(regexp(a,':val=','split'))
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K E
K E 2013-1-30
Great! I thought I could not use regexp here because it was a specific sequence, but turns out I can!

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