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I want to change default validation for all password field.

I want to change for all password field and validation is minimum 8 characters and at least one number include.

Can anyone help me with this?

@chirag, Thanks for your suggestion and from your suggestion i have made changes in register.phtml file and now my requirement is working. Please check below my code.

app/design/frontend/Custom/theme/Magento_Customer/templates/form/register.phtml

I have added below script.

<script type="text/javascript">

require([

    'jquery',

    'jquery/ui',

    'jquery/validate',

    'mage/translate'

], function($){

    $.validator.addMethod(

    'validate-mycustom-password', function (value) {

    return (value.length >= 8 && /^(?=.*?[0-9]).{8,}$/.test(value));

    }, $.mage.__('Minimum 8 characters with at least one number'));

});

</script>

If you want to validate customer login password then override phtml file in to your design folder like below.

app/design/frontend/vendor/theme/Magento_Customer/templates/form/login.phtml

Find the line data-validate="{required:true, 'validate-password':true}"

And replace with data-validate="{required:true, 'validate-mycustom-password':true}"

Add the following code at the end of the file.

<script type="text/javascript">

    require([

        'jquery',

        'jquery/ui',

        'jquery/validate',

        'mage/translate'

        ], function($){

            $.validator.addMethod(

                'validate-mycustom-password', function (value) { 

                    return (value.length == 6 && /^-?d+$/.test(value));

                }, $.mage.__('Password length should be 6 and only numbers are allowed'));

        });

</script>

Don't forgot to run necessary command like static:content:deploy & cache:flush

Note: I give a validation for Max limit & allow only number. you have to customize script as per your requirement.

This is a configuration item.

In Stores > Configuration > Customers > Customer Configuration >
Password Options

There is an option for Number of Required Character Classes:

This is available in configuration item in the Admin Panel

In Stores > Configuration > Customers > Customer Configuration > Password Options there are options like Minimum Password Length and Number of Required Character Classes