The required characters rule ensures that passwords contain certain character categories.
Required characters are necessary to make a password stronger. For example, if you set the minimum number of uppercase characters to 4, then the password "ElePHant" will be rejected.
To configure the required characters rule
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Follow the steps outlined in Configuring Password Policy Rules. 
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On the Policy Rules tab, click Required Characters Rule to expand the rule settings. 
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Under Required Characters Rule, select the Password must contain at least check box, and then specify the following options as required: 
