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MySQL: Replace non alphanumeric with _ in NOW()

Posted on 2014-01-24
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Last Modified: 2014-01-24
This:
SELECT (REPLACE(NOW() ,'[0-9]+','_'))

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returns this:
2014-01-24 07:48:31
How can I get this?
2014_01_24_07_48_31
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Question by:hankknight
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Chris Stanyon earned 500 total points
ID: 39806910
You can't replace multiple characters like that, so you could nest three REPLACE statements to remove the -, : and space:

SELECT REPLACE(REPLACE(REPLACE(NOW() ,'-','_'),':', '_'), ' ', '_')

Alternatively if it's to get a specific format for your date, then just use DATE_FORMAT:

SELECT DATE_FORMAT(NOW(),'%Y_%m_%d_%H_%i_%s');
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