word manupulation

i have 1 file in excel POS.xlsx contain word like this

A           B
hello      hi
enter     exit
me        you
love      hurt
what      how

when enter this word in edit text,my code working only for single wording let say i enter 'hello', it would show 'hi' when i enter 'hello me what' it wont show 'hi you how' what should i do to get that answer? below is my current code.

   txt1=get(handles.ayat,'string');

[num,txt]=xlsread('POS.xlsx');

for i=1:length(txt)
    txt2=txt{i,1};

      compare1=strcmp(txt1,txt2)

      if compare1 == 1 

          textOut=txt(i,2);

          set(handles.tag,'String',textOut);
          return;

      else

          promptMessage = sprintf('Maaf. Perkataan yang anda cari tidak terdapat dalam database');
          selectedButton = questdlg(promptMessage, 'Mesej','Cuba Perkataan Lain','Keluar', 'Cuba Perkataan Lain');

          if strcmp(selectedButton, 'Cuba Perkataan Lain')

              set(handles.ayat,'String','');
          return;
          end
          clear all;
          clc;
          close all;
          return;

      end 

end

for i=1:length(txt)

      txt2=txt{i,1};
      txt3=txt{i,2};
      t = strcat(txt1,txt3);

      if t == 1 

          textOut=txt(i,2);

          set(handles.tag,'String',textOut);

      end
  end

Answer 1

[Andrei Bobrov]

d ={'A'          'B'
'hello'      'hi'
'enter'     'exit'
'me'        'you'
'love'      'hurt'
'what'      'how'};

str1 = 'hello me what';
out = regexprep(str1,d(:,1),d(:,2));

[Amir Hamzah UTeM]

thanks andrei :)

[Amir Hamzah UTeM]

how to check if the word entered is correct or not?

for example when i key in "hello what love" it will return 1

if i key in 'love is hurt' it will return 0