Force GravityView search to be exact for a certain field (Operator 'is' instead of 'like')

gistfile1.php

<?php
/** 
 * Place this in your theme's functions.php
 * Please adapt the form_id and the field key to your own case.
 * This is intended to force GravityView to search for the exact value instead of be more relaxed (default search uses operator LIKE)
 *
 */


add_filter( 'gravityview_fe_search_criteria', 'my_gv_exact_search', 20, 2 );
function my_gv_exact_search( $search_criteria, $form_id = '' ) {

	if( '80' != $form_id ) { return $search_criteria; }
	if( empty( $search_criteria['field_filters'] ) || !is_array( $search_criteria['field_filters'] ) ) { return $search_criteria; }

	foreach( $search_criteria['field_filters'] as $k => $filter ) {
		if( !empty( $filter['key'] ) && '5' == $filter['key'] ) {
			$search_criteria['field_filters'][ $k ]['operator'] = 'is';
			break;
		}
	}

	return $search_criteria;
}