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negated character class in mysql regexp

Posted on 2010-11-24
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Last Modified: 2012-06-27
Hi

In mysql regexp how do you specify a negated character class? By this i mean something like

not [atcg]

i.e. anything other than those 4 letters

thanks
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Question by:andieje
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8 Comments
 
LVL 52

Expert Comment

by:_agx_
ID: 34210270
regexp '[^(a|t|c|g)]'

... or

not regexp '(a|t|c|g)'
0
 
LVL 52

Expert Comment

by:_agx_
ID: 34210308
ignoring case:

regexp '[^(aA|tT|cC|gG)]'

.. or

NOT regexp '(aA|tT|cC|gG)'
0
 

Author Comment

by:andieje
ID: 34227301
hi that's not what i meant. I wanted to use the negated character class as part of a larger regular expression please.
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LVL 52

Expert Comment

by:_agx_
ID: 34235675
Depends on the existing expression.  Can you post it and describe what you're trying to add to that expression?
0
 

Author Comment

by:andieje
ID: 34248772
where column REGEXP '^[ATCG]/<negated character class goes here>'

so i want to match and a,t,c or g at the start followed by a slash followed by a character that is NOT atcg
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LVL 52

Accepted Solution

by:
_agx_ earned 500 total points
ID: 34253625
WHERE column REGEXP '^[ATCG]/[^ATCG]'

0
 

Author Closing Comment

by:andieje
ID: 34262443
simple enough :)
0
 
LVL 52

Expert Comment

by:_agx_
ID: 34264007
... and almost symmetrical too :)
0

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