search for keywords in text file

hi there I want to do search in TEST.txt, for 'Area' and 'class' keywords. if both exist display 'yes'. could you plz help me about that?

my code:

filetext = fileread('TEST.txt');

expr1 = '[^\n]*[Aa]rea[^\n]*';
matchstr = regexp(filetext,expr1,'match');

expr2 = '[^\n]*[Cc]lass[^\n]*';
matchstr = regexp(filetext,expr2,'match');

if matchstr(filetext,expr1)&& matchstr(filetext,expr2)
 disp (yes)
end

error: Index in position 1 exceeds array bounds.

Answer 1

[Guillaume]

• You're overwriting your matchstring variable in the second regexp call, losing the result of the first call.
• your matchstr(fileext, expr1) is complete nonsense. It is trying to index a scalar logical with two char arrays.

The correct expression would be:

if regexp(filetext,expr1,'match') & regexp(filetext,expr2,'match')
    disp('yes');
end

It is puzzling how you could come up with the regular expressions but then write complete nonsense code.

[Paolo]

Perhaps even just one regular expression with an OR operator (and a different conditional statement of course).

[Guillaume]

Doh!

if ~isempty(regexp(filetext, expr1)) && ~isempty(regexp(filetext, expr2))
    disp('yes');
end

[narges]

Thanks a lot Guillaume :) it works

[Paolo]

@narges You can also use regexpi instead of regexp for case insensitivity.

[narges]

much better. thanks a lot :)