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get unknow Strings(Text) out of other strings ?

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Max Müller
Max Müller on 10 Sep 2014
Commented: Star Strider on 11 Sep 2014
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.


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Accepted Answer

Guillaume on 10 Sep 2014
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.


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Max Müller
Max Müller on 10 Sep 2014
Hence Matlab uses C++, can i take the c++ regular expression help ?
Guillaume on 11 Sep 2014
Matlab regular expression engine is slightly different than C++ std::regex and other posix compliant regexes, it's not as good on some things (e.g. captures) but the basics are the same so, yes, you can use tutorial for C++ or any other language.
This one seems to cover the basics and is language agnostic.
Star Strider
Star Strider on 11 Sep 2014
@Guillaume — That has to be one of the best explanations of regexp I’ve read!

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