hi sumit , it resolved by below code , which to be placed in functions.php
// Search SQL filter for matching against post title only.
function __search_by_title_only( $search, $wp_query )
{
global $wpdb;
if ( empty( $search ) )
return $search; // skip processing – no search term in query
$q = $wp_query->query_vars;
$n = ! empty( $q[‘exact’] ) ? ” : ‘%’;
$search =
$searchand = ”;
foreach ( (array) $q[‘search_terms’] as $term ) {
$term = esc_sql( like_escape( $term ) );
$search .= “{$searchand}($wpdb->posts.post_title REGEXP ‘[[:<:]]{$term}[[:>:]]’)”;
$searchand = ‘ AND ‘;
}
if ( ! empty( $search ) ) {
$search = ” AND ({$search}) “;
if ( ! is_user_logged_in() )
$search .= ” AND ($wpdb->posts.post_password = ”) “;
}
return $search;
}
add_filter( ‘posts_search’, ‘__search_by_title_only’, 1000, 2 );