Need help with Web Edit Profile Snippet

Error:	Function ereg() is deprecated	 
  Error type/ Nr.:	 - 8192	 
  File:	E:\xampp\htdocs\assets\snippets\weblogin\webeditprofile.inc.php	 
  Line:	42	 
  Line 42 source:	 $output = webLoginAlert("Password typed is mismatched").$tpl;

if($_POST['email']=='' || !ereg("^[-!#$%&'*+./0-9=?A-Z^_`a-z{|}~]+", $_POST['email'])){
		$output = webLoginAlert("E-mail address doesn't seem to be valid!").$tpl;
		return;
	}

if($_POST['email']=='' || !ereg("^[-!#$%&'*+./0-9=?A-Z^_`a-z{|}~]+", $_POST['email'])){
		$output = webLoginAlert("E-mail address doesn't seem to be valid!").$tpl;
		return; 
}

if(!preg_match("/^[-!#$%&'*+./0-9=?A-Z^_`a-z{|}~]+/i", $str)){
		$output = webLoginAlert("E-mail address doesn't seem to be valid!").$tpl;
		return; 
}

PHP error debug
  Error:	preg_match() [function.preg-match]: Unknown modifier '0'	 
  Error type/ Nr.:	Warning - 2	 
  File:	G:\xampp\htdocs\assets\snippets\weblogin\webeditprofile.inc.php	 
  Line:	42	 
  Line 42 source:	 $output = webLoginAlert("Password typed is mismatched").$tpl;

if($_POST['email']=='' || !preg_match("/^[-!#$%&'*+./0-9=?A-Z^_`a-z{|}~]+/i", $_POST['email'])){
		$output = webLoginAlert("E-mail address doesn't seem to be valid!").$tpl;
		return; 
}

PHP error debug
  Error:	preg_match() [function.preg-match]: Unknown modifier '0'	 
  Error type/ Nr.:	Warning - 2	 
  File:	G:\xampp\htdocs\assets\snippets\weblogin\webeditprofile.inc.php	 
  Line:	42	 
  Line 42 source:	 $output = webLoginAlert("Password typed is mismatched").$tpl;

if($_POST['email']=='' || !preg_match("/^[-!#$%&'*+.0-9=?A-Z^_`a-z{|}~]+/i", $_POST['email'])){
		$output = webLoginAlert("E-mail address doesn't seem to be valid!").$tpl;
		return; 
}

if($_POST['email']=='' || !preg_match("/^[-!#$%&'*+.\/\0-9=?A-Z^_`a-z{|}~]+/i", $_POST['email'])){
		$output = webLoginAlert("E-mail address doesn't seem to be valid!").$tpl;
		return; 
}