JetSmartFilters Search for the exact value in the list

code.php

<?php

class JSF_Search_In_List {
	
	private $prefix    = 'in_list';
	private $delimiter = '__';
	
	public function __construct() {
		add_filter( 'jet-smart-filters/query/final-query', array( $this, 'modify_query' ) );
		add_action( 'jet-smart-filters/admin/register-dynamic-query', array( $this, 'helper_dynamic_query' ) );
	}
	
	public function modify_query( $query ) {
		
		if ( empty( $query['meta_query'] ) ) {
			return $query;
		}
		
		foreach ( $query['meta_query'] as $i => $clause ) {
			
			if ( ! is_array( $clause ) || false === strpos( $clause['key'] ?? '', $this->prefix . $this->delimiter ) ) {
				continue;
			}
			
			$clause['key'] = str_replace( $this->prefix . $this->delimiter, '', $clause['key'] );
			
			$clause['value'] = sprintf( '\b%s\b', preg_quote( $clause['value'] ) );
			
			$clause['compare'] = 'REGEXP';
			
			$query['meta_query'][ $i ] = $clause;
			
		}
		
		return $query;
		
	}
	
	public function helper_dynamic_query( $dynamic_query_manager ) {

		$dynamic_query_item = new class( $this->prefix, $this->delimiter, 'Jet Smart Filters - Search In List' ) {
			
			public function __construct( $key, $delimiter, $label ) {
				$this->key       = $key;
				$this->delimiter = $delimiter;
				$this->label     = $label;
			}

			public function get_name() {
				return $this->key;
			}

			public function get_label() {
				return $this->label;
			}

			public function get_extra_args() {

				return array(

					'exact_field' => array(
						'type'  => 'text',
						'title' => 'Meta key',
					),

				);

			}

			public function get_delimiter() {
				return $this->delimiter;
			}

		};
		
		$dynamic_query_manager->register_item( $dynamic_query_item );
		
	}
	
}

new JSF_Search_In_List();