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Assuming you only want sentence1 returned, you need to put your whitespace inside your wild card character, like
SELECT ID, sentence FROM texts WHERE sentence LIKE '% $query %'
That way, you get your literal whitespace on either side of your tag. This suffers from limitation that it will miss for leading or trailing words and is unlikely to behave the way you intend around punctuation. You could do better with:
SELECT ID, sentence FROM texts WHERE sentence LIKE '% $query %' OR sentence LIKE '$query %' OR sentence LIKE '% $query' OR sentence = '$query'
But this still doesn't do a great job. If I were to do this, I would just do the simple query
SELECT ID, sentence FROM texts WHERE sentence LIKE '%$query%'
and then filter the results against an appropriate regular expression, like /\b\Q$query\E\b/.

As a side note, you should consider using Placeholders_and_Bind_Values (see DBI) for database access. It protects you from all sorts of security exploits and handles messy escaping issues no trouble. I would actually do the above as

my $sth = $dbh->prepare(<<'EOSQL'); SELECT ID, sentence FROM texts WHERE sentence LIKE ? ESCAPE ? EOSQL $sth->execute("%$query%", '\\'); my $results = []; while (my @row = $sth->fetchrow_array) { push @$results, \@row if $row[1] =~ /\b\Q$query\E\b/; }

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re: DBD-SQLite Regexp by kennethk
in thread DBD-SQLite Regexp by welle

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    [tye]: Is it just me, or do most python things have terrible logging/errors?
    [LanX]: but but but ... the errors are nicely formatted!
    [tye]: 1) The python stack traces show you the names of variables, not the values of variables. Almost never informative.
    [LanX]: do you have a py job now?
    [tye]: Right now I have errors trying to fetch stuff from graphite. It says 'apps not ready, check startup logs'. I eventually find the startup logs and see 'no apps found'. Looking for fixes to this problem...
    [LanX]: no idea ... ask py monks! ;-p
    [tye]: it turns out that this can be caused by almost anything going wrong. If you want to know what caused the problem, you have to try to load each app by-hand to see what problems it is having, because none of those will be logged.
    [tye]: No, I write more Perl than py at work. But I have to deal with plenty of py things.
    [tye]: py monks would just be offended.

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