OID/Portal - Restrict Special Characters to be used in Password

Hi,
Does anyone know how I can restrict the use of special characters ($, &, £...etc) in the OID password? I cannot see an attribute to achive this? orclpwdIllegalValues will stop certain words, but I just want to restrict the use of any of the special characters in any password. All suggestions or information would be much appreciated.
Thanks

Requires custom plugin (using PL/SQL) to add password value checking to OID password policy management capabilities. A description and example code for this is available in chapter 27 of the Oracle® Internet Directory Administrator's Guide, 10g Release 2 (10.1.2) entitled "Oracle Internet Directory Plug-In for Password Policies" available at http://download.oracle.com/docs/cd/B14099_19/idmanage.1012/b14082/plugin_pwdpolicies.htm#i122359

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OID/Portal - Restrict Special Characters to be used in Password

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