How to search for a specific string and only display the sentences that contains it.

I have the following code

if strcmp('Hello', out)

*display only sentences with hello in them*

So my output should be only the sentences with hello in them. What function do I use?

Answer 1

[Sven]

Hi Sam,

regexp is the most flexible way to go:

testStrings = {'some text with hello','more with hello','nothing here','hello'}
regexp(testStrings,'.*hello.*','match','once')

ans = 

    'some text with hello'    'more with hello'    ''    'hello'

There are lots of options such as case sensitivity (regexp() or regexpi()), including or not including any surrounding text (that's what the ".*" does).

Another way (less flexible, more simple) is to use strfind():

strfind(testStrings,'hello')

ans = 

    [16]    [11]    []    [1]

[Sam]

This is what I have so far while~feof(fid)

line=fgetl(fid);

if isempty(line)||strncmp(line, '%',1)||~ischar(line)

continue

end

out=regexp(line, ' ', 'split')

regexp(line,'.*hello.*','match','once')

end

But this just shows my the whole script.

[Sven]

Your line:

out=regexp(line, ' ', 'split')

does nothing (ie, it's not ever used again) except it prints things to the screen. Either remove it or put a ";" after it.

line = 'This line has the word hello in it';
textWithHello = regexp(line,'.*hello.*','match','once');
if ~isempty(textWithHello)
  disp(textWithHello)
else
  disp('The line never had "hello" in it.'
end