<?php
//config

$url = '/new-editor.php';
$file = '/home/pi/.config/lxsession/LXDE-pi/autostart';





                if (preg_match("(http:\/\/.*\..*)", $_POST['text']))
                        {
                                $content = file_get_contents($file);
                                $newContent = preg_replace("(http:\/\/.*\..*)", $_POST['text'], $content);
                                file_put_contents($file, $newContent);

                                header(sprintf('Location: %s', $url));
                                printf('<a href="%s">Moved</a>.', htmlspecialchars($url));
                                exit();
                        } else {
                                echo "Feil: Det du skrev inn er ikke en gyldig URL, den må starte med http://<br>";

                        }

        }
                        $content = file_get_contents($file);
                        $contArray = str_split($content);
                        $tmpContent = preg_grep("(http:\/\/.*\..*)", $contArray);
                        $oldContent = implode($tmpContent);
                        ?>
                        <form action="" method=post>
                        URL til siden som skal vises: <input type="text" name="text" value="<?php echo htmlspecialchars($oldContent) ?>"><br>
                        <input type="submit" />
                        <input type="reset" />
                        </form>