Re: Using regular expressions in LIKE

> > > -----Original Message-----
> > > From: pgsql-general-owner@postgresql.org
> > > [mailto:pgsql-general-owner@postgresql.org]On Behalf Of Együd
Csaba
> > > Sent: Wednesday, January 14, 2004 6:43 AM
> > > To: Pgsql-General@Postgresql.Org (E-mail)
> > > Subject: [GENERAL] Using regular expressions in LIKE
> > >
> > >
> > > Hi All,
> > > I'd like to "compress" the following two filter expressions
> > into one -
> > > assuming that it makes sense regarding query execution
performance.
> > >
> > > ... where (adate LIKE "2004.01.10 __:30" or adate LIKE
> > > "2004.01.10 __:15")
> > > ...
> > >
> > > into something like this:
> > >
> > > ... where adate LIKE "2004.01.10 __:(30/15)" ...
> > >
> > > which means that I need only those rows which has an "adate"
> > > field holding
> > > dates on 2004.01.10 every 30 or 15 minutes at the end. Is it
> > > possible to use
> > > some regular expressions or is it worth at all talking about?
> > >
> > > thanks,
> > > -- Csaba
> > >

How about:

where adate ~ '^2004-01-10 ([0-9]{2}):(15|30)'


There may be a more concise version but this seems to work. Please say
if you want a description of exactly what the string means.

Kind Regards,

Nick Barr
WebBased Ltd.

Tel: (01752) 764445
Fax: (01752) 764446
Email: nick.barr@webbased.co.uk

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