REGEXP with MySQL
In one of the recent projects that I have been working on, I had to look for a word in a phrase - but the challenge was to rank an occurrence of the phrase higher when it’s an individual word as compared to when it was part of a word.
For ex : Food Blogger should rate higher than Ardent Foodie, because in the first example - Food is an individual word as compared to latter where it is part of a whole word.
At times like this, I find MySQL’s REGEXP quite useful, as I can use different regular expressions to fit my criteria. So here’s what I did here
I first looked for an individual occurrence of a word.
select * from table_name where search_term REGEXP '[[:<:]]food[[:>:]]';
Here, [[:<:]] & [[:>:]] are markers that stand for word boundaries. They match the beginning and end of words, respectively. Now, as a next step, I follow it by this query.
select * from table_name where search_term LIKE '%food%';
But when the first case happens, it gets an higher priority as compared to the second case - so I reworked the query to this
select table_name.title, (case when search_term REGEXP '[[:<:]]food[[:>:]]' then 100 when search_term LIKE '%food%' then 99 else 1 end) as priority from table_name order by `priority` desc;
That way, results that have the word as a standalone rank higher up as compared to when they are part of a phrase.