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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$string = "/home/bitrix/ext_www/vm.dev.crm.mts.ru/local/php_interface/scripts";
$pattern = '#(?<=^/home/bitrix/ext_www/)[^/]+#';
if (preg_match($pattern, $string, $matches)) {
echo $matches[0];
}