MATLAB: Get unknow Strings(Text) out of other strings

regexpstrfind

Hey Guys, can u give me an example, that shows how to get information out of a long String ? If……

the Word before the Information u want is known. Example
name: Benny age:23 ( I want the Info Age)
Out of this code 
<HTML><FONT color="0000FF">Used Amplification(Hidden)</FONT></HTML>
I want the Information:Used Amplification(Hidden)

I guess the KEy is regexp again…..but i think i am wrong….sorry for these stupid questions.

Best Answer

If you don't want to learn the regex syntax, you can use strfind:

before = '<HTML><FONT color="0000FF">';
after = '</FONT></HTML>';
start = strfind(str, before) + length(before); %or just length(before)+1 if str always starts with before.
end = strfind(str, after) - 1;
result = str(start:end); %assumes there's only ever one match

It's of course a lot more flexible and shorter with regexes:

 result = regexp(str, '<HTML><FONT color="[0-9A-F]+">(.*?)</FONT></HTML>', 'tokens', 'once'); %with added bonus it will work with any color, not just 0000FF.

Related Solutions

MATLAB: Regexprep / doesnt work backwards

You're not actually using regular expressions. Your search pattern is just a plain string, so you'd be better off using strrep.

The reason it doesn't work with Add as a search pattern is that the ( character has a special meaning in regexes so to match a bracket you need to escape it with a backslash, either manually or using regexptranslate:

regexprep(Text, regexptranslate('escape', Add), Search)

But as I said

strrep(Text, Add, Search)

would work just as well and will probably be faster.

MATLAB: Change Color of each individual String in a Listbox

Data(1).name = 'red';
Data(1).Color = [255 0 0];
Data(2).name = 'green';
Data(2).Color = [0 255 0];
Data(3).name = 'blue';
Data(3).Color = [0 0 255];
pre = '<HTML><FONT color="';
post = '</FONT></HTML>';
listboxStr = cell(numel( Data ),1);
for i = 1:numel( Data )
   str = [pre rgb2Hex( Data(i).Color ) '">' Data(i).name post];
   listboxStr{i} = str;
end
figure; hListBox = uicontrol('Style','list', 'Position', [20 20 100 100], 'String', listboxStr );

That should give you an example of what you want with the following function defined based on Guillame's input above :

function hexStr = rgb2Hex( rgbColour )
hexStr = reshape( dec2hex( rgbColour, 2 )',1, 6);

Obviously if you have a pre-existing listbox from Guide you can just do the usual:

set( handles.listbox1, 'String', listboxStr )

instead of creating a new listbox.

Best Answer

Related Solutions

MATLAB: Regexprep / doesnt work backwards

MATLAB: Change Color of each individual String in a Listbox

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