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

Question

Sam 2013-3-3

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关闭： MATLAB Answer Bot 2021-8-20

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?

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Answer 1

Sven 2013-3-3

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编辑：Sven 2013-3-3

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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]

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Sam 2013-3-3

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 2013-3-4

在 MATLAB Online 中打开

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