imread problem - regexp?

[Assa Sittner]

hello everyone,
i'm new to octave, so excuse me if the question is trivial,
i'm having the following problem:
"
octave:4> I=imread("gel")
error: `regexp' undefined near line 150 column 11
error: evaluating assignment expression near line 150, column 9
error: called from `imread:re_grab' in file `/home/assaz/imread.m'
error: evaluating assignment expression near line 69, column 11
error: called from `imread' in file `/home/assaz/imread.m'
error: evaluating assignment expression near line 4, column 2

"
there seems to be a problem with the code:
around line 150,i have:
lines 149-157

function value = re_grab(re, str)
    idx = regexp(re, str);
    if !isempty(idx)
        idx = idx(2,:);
        value = substr(str, idx(1), diff(idx)+1);
    else
        value = "";
    endif
endfunction


in line 69 i have:
depth = re_grab("Red: ([[:digit:]]{1,2})", ident);

how do i go about it?
thanks,
--
Assa




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