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From: Tom Lane <[email protected]>
To: Ken Tanzer <[email protected]>
Cc: [email protected]
Subject: Re: Regexp matching: bug or operator error?
Date: Tue, 23 Nov 2004 19:01:39 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Ken Tanzer <[email protected]> writes:
> Using Postgres V. 7.4.1, the following query:

>     SELECT substring('X12345X' FROM '.*?([0-9]{1,5}).*?');

> Returns '1'.  I would expect it to return '12345'.  Is this a bug, or am 
> I missing something?  Thanks.

Hmm ... playing with it, it seems that there may indeed be a bug here
... it's acting like the "non greedy" flag from the .*? is being applied
to the {m,n} as well.  In other words the behavior would be correct for

     SELECT substring('X12345X' FROM '.*?([0-9]{1,5}?).*?');

However, aren't you doing this the hard way?  Why not just

	SELECT substring('X12345X' FROM '([0-9]{1,5})');

			regards, tom lane

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