how to define the occurance of a word in a text?

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jojototo
jojototo 2017-7-28
评论： jojototo 2017-8-15
Hi all,I need that code badly,I have a text'.txt'.I have chosen two words"are" and "the" which are repeated along the text so I need a code to read the text and if the word "are" comes put "1" and if the word "the" comes put "0" sequentially so a series of binary digits"x" is formed. for example x=1 0 0 1 1 1 1 0 that means "are" occurs first then "the"occurs twice then"are" four times then"the" and so on until the text ends.thanks
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Walter Roberson
Walter Roberson 2017-7-30
So not counted if there is a comma, period, exclamation mark, colon, semi-colon, apostrophe or double quote or other quote marks?
jojototo
jojototo 2017-7-31
Oh my god,I didn't think about all these possibilities .You're absolutely right all these are counted of course.

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Walter Roberson
Walter Roberson 2017-7-30
whichone = strcmp('and', lower(regexp(str, '(?<=^| )(([tT]he)|([aA]nd))(?=$| )', 'match')));
whichone is 1 for each occurrence of 'and' and 0 for each occurrence of 'the'
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Walter Roberson
Walter Roberson 2017-8-9
Break it up into pieces.
thes = regexp(str, '(?<=^|["'' ])([tT]he ?)(?=$|[,.!:;"'' ])');
this finds "the" or "The" that are preceded by beginning of line or by a space or double quote or apostrophe, and which might be followed by a space, and after that followed by a comma, period, exclamation mark, colon, semi-colon, double-quote, apostrophe, or space. The "the" or "The" and the possible space are extracted, but not what follows that.
Once you have these, you can tell the cases apart by various ways, including comparing the last character to a space, or just looking at the length:
cellfun(@length, thes)
length 3 has no space after it, length 4 had a space after it.
Unfortunately, though, you have an ambiguous situation. At the end of the line, you cannot tell whether "the" followed by space followed by end of line is the "normal" case or the "extra space" case. This code will detect it as if it is the "extra space" case, but that is arguably wrong: it could instead be a "normal space" that happens to be followed by nothing.
As I wrote before, "Rules! We need rules!" -- and those rules need to define what the "correct" outcome is in each potentially ambiguous situation.

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