Fix MongoDB presence verification for values containing regex delimiters

[zigzagdev]

Description

This PR fixes an issue in the MongoDB presence verifier where validation queries could break (or behave unexpectedly) when the input contained regex delimiter characters such as /.

Motivation

The verifier builds a MongoDB regex from user input to perform a case-insensitive exact match. However, the previous implementation used preg_quote without specifying a delimiter and also mixed regex options in a way that could lead to incorrect patterns. This becomes visible when validating values like Foo/Bar.

###What changed

• Escaped input using preg_quote((string) $value, '/') so / (and other delimiter-related characters) are safely handled.
• Constructed MongoDB\BSON\Regex using the correct options argument ('i') rather than embedding flags in the pattern string.
• Queried using the Regex object directly (where($column, $regex)) instead of passing 'regex' as an operator.
• Applied the same escaping approach for getMultiCount() when building a regex alternation.
• Added a regression test covering Foo/Bar as well as case-insensitive matching and “partial should not match”.

Why passing the Regex object directly

The MongoDB query builder expects a MongoDB\BSON\Regex instance to be provided as the value for a regex comparison.
Using where($column, 'regex', $regex) relies on an operator string that may not be interpreted consistently across the MongoDB driver / query builder implementation, whereas passing the Regex object directly (where($column, $regex)) is the explicit and supported way to perform regex matching.

Test plan

./vendor/bin/phpunit

Specifically verified the new cases added in tests/ValidationTest.php (values containing /, case-insensitive exact match, and partial mismatch).

Checklist

• Add tests and ensure they pass

[Copilot]

Pull request overview

This PR fixes a bug in the MongoDB presence verifier where validation queries failed when input values contained regex delimiter characters (e.g., /). The fix ensures proper escaping of user input and correct construction of MongoDB regex objects for case-insensitive exact matching.

Changes:

• Updated getCount() to properly escape input with delimiter and construct MongoDB\BSON\Regex with correct options
• Updated getMultiCount() to apply the same escaping approach for multiple values
• Added regression tests verifying validation of values containing /, case-insensitive matching, and partial match rejection

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Validation/DatabasePresenceVerifier.php	Fixed regex escaping and construction in both getCount() and getMultiCount() methods
tests/ValidationTest.php	Added test cases for slash-containing values, case-insensitive matching, and partial match validation

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