问题
I've been trying to find exact words and my research isn't helping me.
Solutions I've found:
$query .= "WHERE text REGEXP '[[:<:]]($word)[[:>:]]'";
// OR
$query .= "WHERE MATCH(text) AGAINST('$word') ";
but neither are returning my matches.
I'm searching for stock symbols in my db (eg $aapl). And using LIKE '%$word%' will return $bac if you search for $ba.
回答1:
You will want to use MySql Full Text Search functions to accomplish what you describe above.
Enjoy!
回答2:
MATCH AGAINST doesn't work exactly how you'd think it would.
This can be summarized by Casey Fulton as "...FULLTEXT searches only [return] anything if the number of results is less than 50% of the total table size..."
So instead, I'm searching for all the LIKEs and then filtering out exact words by a REGEX. I'm doing this to cut down on the process load for REGEX.
The following is my solution:
$likerows = "(SELECT * FROM `tweets` WHERE text LIKE '%$q%') AS likerows ";
$regexrows = "(SELECT * FROM $likerows WHERE text REGEXP('^.* $q .*$')) AS regexrows ";
$query = "SELECT * FROM $regexrows ";
I put spaces around the $q because I want to match a sentence-structured word (which is preceeded and followed by a space).
Also, I'm searching for "words" that start with $. This was an issue and here's what I did to solve that problem:
if(substr($q, 0, 1) == '$') $q = '\\\\' . $q; // you have to escape the backslash that escapes the $ -- it's nuts.
Best of luck.
来源：https://stackoverflow.com/questions/3999180/mysql-search-exact-word-with-in-word