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Pattern attribute

As explained in Pro Angular 16

The pattern attribute is an HTML form-control attribute that requires entered text to match a specified regular expression pattern.

The pattern attribute validates entered text against a regular expression. In an Angular template, it works alongside other validation attributes such as required and minlength. section 13.4.2

Restricting product names

Use pattern="^[A-Za-z ]+$" to allow only alphabetic characters and spaces. The input also needs a name attribute, and Angular validation requires the control to be inside a form. section 13.4.2

How Pro Angular 16 covers it

How deep it goes
Defines the constraint and demonstrates feedback, but defers regular-expression construction and custom validation rules.
Examples
Demonstrates a product-name input accepting alphabetic characters and spaces through the pattern ^[A-Za-z ]+$.
What it assumes
Assumes Angular template forms and regular-expression syntax while establishing the required form and name configuration.
What you can do after
Apply it via an Angular template to constrain input and report pattern-specific validation errors.
How it connects
Connects regular expressions with Angular forms, template-driven validation, validation attributes, and validation state.
Cover of Pro Angular 16
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This explainer was generated by Manning's knowledge graph from the text of Pro Angular 16. The section links point to the parts of the book it draws on.