regex - MySQL - REGEXP for matching a number preceded by '#' and NOT followed by another number -


I think I have already explained in the title, I want to select all rows in the table of a REGEXP pattern A typical column is needed This pattern is complete:

Characters '#' after the given number, e.g. For example, the given number '5': 

  (# 12 + # 55-), '5' must be present at least once, and not from any other number.  # 8) / # 2 - & gt; Pattern should not match (# 12 + # 5- # 8) / # 2 - & gt; Pattern must match (# 12 + # 55- # 5) / # 2 - & gt; Pattern should match   
 Unfortunately I'm not a regex expert and I have already wasted a few hours without much success. Any help is very welcome.   
 
 
 In that case, the following will work:  
  ^. *? (# 5) ([^ 5] | $). *? $

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