Discover and Substitute Textual content with SQL Common Expressions in Rockset

October 31, 2023

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In our first weblog, we used a daily expression to interchange the quotes in genres. Afterward, we have been capable of UNNEST() the JSON object. We’ll be working with the identical knowledge set on this weblog

In our knowledge:

Embedded content material: https://gist.github.com/nfarah86/ef1cc9da88e56226c4c46fd0e3c8e16e

there’s a JSON string that’s known as spoken_languages, and it’s formatted equally to genres:

[ { "spoken_languages": "[{'iso_639_1': 'fr', 'name': 'Français'}]" }]

Assuming every little thing is constant, we will simply write the SQL assertion much like what we wrote for genres— proper?

Find and replace text using regular expression in SQL - drums

Incorrect ⛔️

We really get a parsing error:
json parse error on line 0 close to `x9akai”}, {“iso_’: unknown escape 120 in string

So, we form of know what the offender is right here, however we don’t know if there are going to be extra parsing errors. Let’s go forward and debug this, so we will get this SQL assertion working!

We are able to really use REGEXP_LIKE() to see what precisely is inflicting the error:

SELECT
    spoken_languages
FROM
    commons.TwtichMovies t
WHERE REGEXP_LIKE(t.spoken_languages,'x9akai')

This can be a pattern of what we get again:

Find and replace text using regular expression in SQL - sample query

That is nice— it seems to be just like the are literally inflicting some points. We are able to use REGEXP_REPLACE() to interchange these slashes with an empty string:

SELECT (REGEXP_REPLACE('Lietuvix9akai', '',''));

Now— to place all of it collectively: How will we UNNEST() spoken_languages and repair the two points at hand (the string format and the double slashes)?

Trace:

 SELCT REGEXP_REPLACE(REGEXP_REPLACE('[{''iso_639_1'': ''lt'', ''name'':''Lietuvix9akai''}]', '''', '"'), '', '');

I’m certain you possibly can take it to the end line from right here, however simply in case, you possibly can watch this youtube hyperlink down beneath to catch the complete replay!

Embedded content material: https://youtu.be/8aHgJrQjT4U

TLDR: you will discover all of the sources you want within the developer nook.

Supply hyperlink