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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