john-users - JTR with only characters a-z / 0-9

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Date: Sat, 6 Mar 2010 07:55:41 +0100
From: "websiteaccess@...il.com" <websiteaccess@...il.com>
To: john-users@...ts.openwall.com
Subject: JTR with only characters a-z / 0-9

Hi

 I change in JTr source :

before :
#define CHARSET_MIN			'  '
#define CHARSET_MAX		0x7E

after :
#define CHARSET_MIN			0x30
#define CHARSET_MAX		0x7A

0x30 -> 0x7A =  0-9 + symbols + A-Z + a-z

 I just want use a-z and 0-9, can I exclude all others symbol except 
a-z / 0-9 ? and to do ?
 for example : I want crack only passwods that contains a-z and/or 0-9
 thanks,

 W.A.