我正在尝试编辑验证用户注册的函数的a部分，我需要更改错误响应的语言，因为我将sanitize\\u user（）修改为不允许“@”和“.”。因此，我需要在..下编辑错误响应。。

//用户名必须通过WP的有效性检查。

并将错误文本响应更改为我选择的内容。我如何连接和修改部分？

function bp_core_validate_user_signup( $user_name, $user_email ) {

    // Make sure illegal names include BuddyPress slugs and values
    bp_core_flush_illegal_names();

    // WordPress Multisite has its own validation. Use it, so that we
    // properly mirror restrictions on username, etc.
    if ( function_exists( \'wpmu_validate_user_signup\' ) ) {
        $result = wpmu_validate_user_signup( $user_name, $user_email );

    // When not running Multisite, we perform our own validation. What
    // follows reproduces much of the logic of wpmu_validate_user_signup(),
    // minus the multisite-specific restrictions on user_login
    } else {
        $errors = new WP_Error();

        // Apply any user_login filters added by BP or other plugins before validating
        $user_name = apply_filters( \'pre_user_login\', $user_name );

        // User name can\'t be empty
        if ( empty( $user_name ) ) {
            $errors->add( \'user_name\', __( \'Please enter a username\', \'buddypress\' ) );
        }

        // user name can\'t be on the blacklist
        $illegal_names = get_site_option( \'illegal_names\' );
        if ( in_array( $user_name, (array) $illegal_names ) ) {
            $errors->add( \'user_name\', __( \'That username is not allowed\', \'buddypress\' ) );
        }

        // User name must pass WP\'s validity check
        if ( ! validate_username( $user_name ) ) {
            $errors->add( \'user_name\', __( \'Usernames can contain only letters, numbers, ., -, and @\', \'buddypress\' ) );
        }

        // Minimum of 4 characters
        if ( strlen( $user_name ) < 4 ) {
            $errors->add( \'user_name\',  __( \'Username must be at least 4 characters\', \'buddypress\' ) );
        }

        // No underscores. @todo Why not?
        if ( false !== strpos( \' \' . $user_name, \'_\' ) ) {
            $errors->add( \'user_name\', __( \'Sorry, usernames may not contain the character "_"!\', \'buddypress\' ) );
        }

        // No usernames that are all numeric. @todo Why?
        $match = array();
        preg_match( \'/[0-9]*/\', $user_name, $match );
        if ( $match[0] == $user_name ) {
            $errors->add( \'user_name\', __( \'Sorry, usernames must have letters too!\', \'buddypress\' ) );
        }

        // Check into signups
        $signups = BP_Signup::get( array(
            \'user_login\' => $user_name,
        ) );

        $signup = isset( $signups[\'signups\'] ) && ! empty( $signups[\'signups\'][0] ) ? $signups[\'signups\'][0] : false;

        // Check if the username has been used already.
        if ( username_exists( $user_name ) || ! empty( $signup ) ) {
            $errors->add( \'user_name\', __( \'Sorry, that username already exists!\', \'buddypress\' ) );
        }

        // Validate the email address and process the validation results into
        // error messages
        $validate_email = bp_core_validate_email_address( $user_email );
        bp_core_add_validation_error_messages( $errors, $validate_email );

        // Assemble the return array
        $result = array(
            \'user_name\'  => $user_name,
            \'user_email\' => $user_email,
            \'errors\'     => $errors,
        );

        // Apply WPMU legacy filter
        $result = apply_filters( \'wpmu_validate_user_signup\', $result );
    }

    return apply_filters( \'bp_core_validate_user_signup\', $result );
}