cut matched pattern from column

i have bunch of rows containing http://www.do开发者_开发知识库mainname.com i need to update those so http:// part is gone how to do this elegantly within one query execution??

e.g. table 'video', column in question 'url'

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try

UPDATE `video` SET `url` = REPLACE(`url`,"http://","")

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First execute the query below to ensure that the output is as expected

SELECT SUBSTRING(url,  8) as url FROM video;

If you are satisfied execute

UPDATE video SET url = SUBSTRING(url,  8);