Require entire matches by default with Constraint::matchesRegex()

[giuscris]

This pull request introduces updates to regex patterns across multiple files to improve flexibility and consistency, as well as enhancements to the matchesRegex method to support partial or full regex matches.

Now patterns need to match the entire string by default, as if they were wrapped between ^(?: and )$.
This is to avoid unexpected matches and be consistent with the browser validation with pattern specified with the <input pattern="..."> attribute.

Below is a summary of the most important changes:

Method Enhancement:

• Modified the matchesRegex method in formwork/src/Utils/Constraint.php to include an optional $entireMatch parameter, defaulting to true. This allows for both full and partial regex matches by dynamically appending anchors when needed.

[Copilot]

Pull Request Overview

This PR standardizes regex usage by removing manual anchors from pattern definitions and enhances the matchesRegex utility to automatically enforce full-string matches by default (with an option for partial matches).

• Removed ^/$ anchors from YAML and PHP pattern values
• Added an $entireMatch parameter to matchesRegex (default true) to wrap patterns with ^(?:…)$
• Updated the color field validator to use the new unanchored pattern

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
site/schemes/config/site.yaml	Stripped ^/$ from language code pattern
panel/modals/newPage.yaml	Removed anchors from slug pattern
formwork/schemes/config/system.yaml	Updated file extension pattern to drop explicit ^/$ anchors
formwork/src/Utils/Constraint.php	Added $entireMatch parameter and dynamic anchoring in matchesRegex
formwork/fields/color.php	Switched to unanchored hex color pattern in validation

Comments suppressed due to low confidence (3)

formwork/src/Utils/Constraint.php:64

• Update the docblock for matchesRegex to document the new $entireMatch parameter, including its default behavior and how it affects regex anchoring.

    /**

formwork/src/Utils/Constraint.php:69

• Add unit tests to cover both default (full match) and partial match behaviors of matchesRegex, including cases with $entireMatch set to false.

        if ($entireMatch) {

site/schemes/config/site.yaml:57

• [nitpick] Add a comment explaining that anchors (^,$) are no longer needed since matchesRegex enforces full-string matching by default.

        pattern: '[a-z]{2,3}'