How to Extract and Count Specific Words from MySQL Strings?

Extracting Specific Words and Counting Occurrences from MySQL Strings

Many users seek a MySQL query syntax that enables them to extract specific words and count their occurrences from a given string. Unlike regular expression examples that check for matching text expressions, there is no built-in syntax for text extraction in MySQL.

However, a partial solution can be achieved for specific word extraction scenarios. For instance, to extract the second word, you can use the following code:

SUBSTRING(sentence, LOCATE(' ', sentence) + CHAR_LENGTH(' '), LOCATE(' ', sentence, (LOCATE(' ', sentence) + 1) - (LOCATE(' ', sentence) + CHAR_LENGTH(' '))))

To illustrate, let's consider the following query:

SELECT SUBSTRING(sentence, LOCATE(' ', sentence) + CHAR_LENGTH(' '), LOCATE(' ', sentence, (LOCATE(' ', sentence) + 1) - (LOCATE(' ', sentence) + CHAR_LENGTH(' ')))) as string FROM (SELECT 'THIS IS A TEST' AS sentence) temp

This query will successfully extract the word "IS" as the second word in the string "THIS IS A TEST."

It's important to note that while this approach provides a workaround for specific scenarios, MySQL does not natively support extracting regex matches. For more advanced requirements, consider implementing post-processing on the client or installing a MySQL extension to support text extraction.

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