Custom Woocommerce product search

woocommerce-product-search.php

<?php 

/**
 * Custom Woocommerce product search 
 */
add_filter( 'get_product_search_form', function ( $form ) { 
	$form ='<form role="search" method="get" class="woocommerce-product-search" action="' . esc_url( home_url( '/' ) ) . '">
		<label class="screen-reader-text" for="woocommerce-product-search-field">' . esc_html__( 'Search for:', 'woocommerce' ) . '</label>
		<div class="input-group">
			<input type="search" 
				id="woocommerce-product-search-field" 
				class="search-field form-control form-control-sm" 
				placeholder="' . esc_attr__( 'Search products&hellip;', 'woocommerce' ) . '" 
				value="' . get_search_query() . '" 
				name="s" />
			<button type="submit" 
				class="btn btn-secondary btn-sm" 
				value="' . esc_attr_x( 'Search', 'submit button', 'woocommerce' ) . '">'
				. esc_html_x( 'Search', 'submit button', 'woocommerce' ) . 
				'</button>
			<input type="hidden" name="post_type" value="product" />
		</div>
	</form>';
    return $form; 
}, 10, 1 );