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Regular expression in awk

From	gio001 <gcrippa@gmail.com>
Newsgroups	comp.lang.awk
Subject	Regular expression in awk
Date	2011-04-06 07:40 -0700
Organization	http://groups.google.com
Message-ID	<4e09d4fd-8351-45f0-8f17-b6ac0d32e19a@l18g2000yql.googlegroups.com> (permalink)

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Hello,
I have thousand of messages (HL7), I want to use awk to extract only
the ones that have a particular value in pv1.18
Each record in the file is the whole HL7 message, ie. when I print $0
I get the whole message MSH EVN PID etc. ,there is an x0d between the
segments.
I would like to use a line somewhat like:

awk '{if(/PV1\|\([^|]*\|\)\{16\}\|X/){print $0}}' infile > outfile

I do not seem to be able to get this working properly in awk on a AIX
box.
Yet this statement works fine against the infile:

grep 'PV1\|\([^|]*\|\)\{16\}\|X' infile

Can anyone please help?
Thanks.

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Regular expression in awk gio001 <gcrippa@gmail.com> - 2011-04-06 07:40 -0700
  Re: Regular expression in awk pk <pk@pk.invalid> - 2011-04-06 16:01 +0100
  Re: Regular expression in awk Janis Papanagnou <janis_papanagnou@hotmail.com> - 2011-04-06 19:24 +0200
    Re: Regular expression in awk Manuel Collado <m.collado@domain.invalid> - 2011-04-06 21:07 +0200
    Re: Regular expression in awk gio001 <gcrippa@gmail.com> - 2011-04-06 12:25 -0700
      Re: Regular expression in awk Janis Papanagnou <janis_papanagnou@hotmail.com> - 2011-04-06 23:09 +0200
        Re: Regular expression in awk gio001 <gcrippa@gmail.com> - 2011-04-06 19:59 -0700
          Re: Regular expression in awk Loki Harfagr <l0k1@thedarkdesign.free.fr.INVALID> - 2011-04-07 07:32 +0000
            Re: Regular expression in awk gio001 <gcrippa@gmail.com> - 2011-04-07 05:06 -0700
              Re: Regular expression in awk Loki Harfagr <l0k1@thedarkdesign.free.fr.INVALID> - 2011-04-07 13:34 +0000
                Re: Regular expression in awk gio001 <gcrippa@gmail.com> - 2011-04-07 08:27 -0700
                Re: Regular expression in awk Loki Harfagr <l0k1@thedarkdesign.free.fr.INVALID> - 2011-04-07 18:32 +0000
      Re: Regular expression in awk Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2011-04-07 13:34 +0100
        Re: Regular expression in awk arnold@skeeve.com (Aharon Robbins) - 2011-04-07 13:31 +0000
          Re: Regular expression in awk Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2011-04-08 13:18 +0100

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