Feature: #106072 - Introduce regex-based replacements for slugs

Description

A second replacement configuration array has been added to support regular expression (regex)-based definitions. This allows defining case-insensitive or wildcard replacements for slug generation.

Note

Regular expression replacements are applied before any sanitation of the field values takes place. This means:

Values are still in their original form - not lowercased or otherwise processed.
The replacements apply only to the fields defined in ['generatorOptions']['fields'].
No automatic escaping or character detection is performed, so patterns must be written carefully.

Keep these points in mind when defining regex patterns.

Impact

Slug fields now support a new regexReplacements configuration array inside generatorOptions.

Example TCA configuration

$GLOBALS['TCA'][$table]['columns']['slug']['config']['generatorOptions']['regexReplacements'] => [
    // Case-insensitive replacement of Foo, foo, FOO, etc. with "bar"
    '/foo/i' => 'bar',
    // Remove string wrapped in parentheses
    '/\(.*\)/' => '',
    // Same, using a custom regex delimiter
    '@\(.*\)@' => '',
];