Add bits before last alphabet of every word

How to add watermarks bit before the last alphabet of every word of a string.

[Ameer Hamza]

Can you show an example of what you want by using a simple input and telling us your expected output.

[Balkar Singh]

str='Hello how are you'

i have this string and i want to embed watermark bits before every last letter of each wprd. Thank you

[Walter Roberson]

Suppose that the input was

I, LI.

Then what would the expected outcome be? You can show the binary form if appropriate.

[Balkar Singh]

202DI L202DI this is expected output. I want to embed 202D unicode value before the last letter of every word.

[KALYAN ACHARJYA]

Input: '202D'

Expected Output:'202DI'

right?

[Balkar Singh]

Yes sir. Thanks

Answer 1

[Image Analyst]

Try this:

str = 'MATLAB is a super awesome program';
words = strsplit(str)
for k = 1 : length(words)
	thisString = words{k};
	if length(thisString) >= 2
		words{k} = sprintf('%s%c%c', thisString(1:end-1), char(hex2dec('2020D')), thisString(end));
	end
end
% Reconstruct into a single string
words
str2 = [];
for k = 1 : length(words)
	thisString = words{k};
	str2 = sprintf('%s %s', str2, thisString);
end
str2

You'll see in the command window:

words =

1×6 cell array

{'MATLAB'} {'is'} {'a'} {'super'} {'awesome'} {'program'}

words =

1×6 cell array

{'MATLAB'} {'is'} {'a'} {'super'} {'awesome'} {'program'}

str2 =

' MATLAB is a super awesome program'

except that the FFFF in the boxes don't show up in MATLAB - they're just little empty boxes.

[Image Analyst]

Sorry, the second words is not showing up in the web browser the same way it does in the MATLAB command window. In the MATLAB command window, you can see that there is a little box (representing the special non-printable character) just before the last letter of every word, and in the browse (before I submitted it) the little boxes has 4 F's in them.

[Balkar Singh]

Thanks

Answer 2

[Ameer Hamza]

This example show how to add the Unicode U+202D before the last character of every word. It also ignores full stops (.) and comma (,) while making a replacement. Since this Unicode character is invisible and has no effect on visible effect on the left to right characters, you can see the replacement is being made by comparing the length of the strings.

str = 'A quick brown fox, jumps over the lazy dog.';
l1 = numel(str);
new_str = regexprep(str, '([A-Za-z][\s\.,])', [char(hex2dec('202D')) '$1']);
l2 = numel(new_str);

>> l1
l1 =
    43
>> l2
l2 =
    52

You can also see that the replacement are being made by adding a dummy character (say a) after U+202D.

str = 'A quick brown fox, jumps over the lazy dog.';
new_str = regexprep(str, '([A-Za-z][\s\.,])', [char(hex2dec('202D')) 'a$1']);
new_str =
    'aA quicak browan foax, jumpas ovear thae lazay doag.'

[Balkar Singh]

str = 'Most teachers waste their time by asking questions that are indended to discover what the pupil does not know, whereas the true art of questioning is to discover what the pupil does know or is capable of knowing';

new_str = 'Mos‭at teacher‭as wast‭ae thei‭ar tim‭ae b‭ay askin‭ag question‭as tha‭at ar‭ae indende‭ad t‭ao discove‭ar wha‭at th‭ae pupi‭al doe‭as no‭at kno‭aw, wherea‭as th‭ae tru‭ae ar‭at o‭af questionin‭ag i‭as t‭ao discove‭ar wha‭at th‭ae pupi‭al doe‭as kno‭aw o‭ar i‭as capabl‭ae o‭af knowing'

str is my string and new_str is the new string. Last word knowing is not covered to embed the data.

Please help.

Thanks again.

[Ameer Hamza]

Balkar, Stephen's answer covers that case. Please check it.

[Balkar Singh]

Thanks I got

Answer 3

[Stephen23]

Simpler:

>> str = 'A quick brown fox, jumps over the lazy dog';
>> out = regexprep(str,'(\w)\>','\x202D$1')
out =
A quick brown fox, jumps over the lazy dog

[Balkar Singh]

Thanks

[Balkar Singh]

How to extract these embedded bits by using regular expression. Thanks in advance

[Stephen23]

regexp(out,'\x202D','match')

[Balkar Singh]

Thanks Sir. It solved my problem.

[Balkar Singh]

A quic202Dk brow202Dn fo202Dx, jump202Ds ove202Dr th202De laz202Dy do202Dg200E200C202C.

I embedded 202D before last letter of every word and 200E200C202C before the '.' punctuation.

In the las question I asked you sir, how to extract 202D by using regular expression, sir I want to extract only 200E200C202C by using regular expression. Please help. Thanks Sir

[Stephen23]

regexp(out,'\x200E\x200C\x202C','match')

[Balkar Singh]

Thanks sir

[Balkar Singh]

regular expression will work on like 200E+200E . I want to ask if I embedded data in this form then same method will be used to extract

[Walter Roberson]

the \x tells matlab that the next part is hexadecimal representation of one character, and is not to match actual 200E character sequence. The \x is important

[Balkar Singh]

ok sir but actually i want to embed the combination of hexadecimal and extraction of it.Thanks

[Image Analyst]

Is this your homework you're asking us to do? It sounds quirky enough, just like homework.

http://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers

[Balkar Singh]

No sir this is not my homework. I am at the learning stage.