3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $str = 'ajf097ebalu42784693052895=gs 0 1 2 3 4 5 6 7 8 9 0 �         10       20           30   ! " # $ % & \' 40 ( ) * + , - . / 0 1 50 2 3 4 5 6 7 8 9 : ; 60 < = > ? @ A B C D E 70 F G H I J K L M N O 80 P Q R S T U V W X Y 90 Z [ \ ] ^ _ ` a b crg@%$Udtth245456769-_23574690-_-+rwyeyfw,./\',mnbvcxzawerty`'; echo preg_replace(['~[^\d]~', '~^a~'], ['', ''], $str);
based on 6uvba
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
0974278469305289501234567890102030400150234567896070809024545676923574690