php - Capture number inside square brackets after # sign -

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I have email subjects who have this section: 

  [message # 15]

I want to remove 15 numbers from the subject, how do I get it? Preferably use PHP, but any regex answer is acceptable.

You can use: 

  '/ \ [[ ^ #]] * # (\ D +) (? = \]) / '

and use the captured group # 1


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