help with preg_replace

From	bill <william@TechServSys.com>
Newsgroups	comp.lang.php
Subject	help with preg_replace
Date	2017-04-13 07:57 -0400
Organization	Aioe.org NNTP Server
Message-ID	<ocnp48$1oei$1@gioia.aioe.org> (permalink)

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I am trying to strip all non-numeric characters from a string.
This is my best guess, but it doesn't do anything to the input 
string.

$number =preg_replace("[^0-9]","",$phone);

when $phone is '1a2bc34567890'

--bill

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help with preg_replace bill <william@TechServSys.com> - 2017-04-13 07:57 -0400
  Re: help with preg_replace tony@mountifield.org (Tony Mountifield) - 2017-04-13 12:06 +0000
    Re: help with preg_replace Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-04-13 14:51 +0200
      Re: help with preg_replace bill <william@TechServSys.com> - 2017-04-14 11:13 -0400
    Re: help with preg_replace bill <william@TechServSys.com> - 2017-04-14 11:12 -0400

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