$re = '/import\s+(?:(?:([A-z_$][\w$]*)|\*\s+as\s+([A-z_$][\w$]*)|({\s*[A-z_$][\w$]*(?:\s+as\s+[A-z_$][\w$]*)?\s*(?:,\s*[A-z_$][\w$]*(?:\s+as\s+[A-z_$][\w$]*)?\s*)?}))\s+from\s+(("|\'|`).*\5)|(("|\'|`).*\7))/';
$str = 'import defaultExport from "module-name";
import * as name from "module-name";
import { export1 } from "module-name";
import { export1 as alias1 } from "module-name";
import { export1 , export2 } from "module-name";
import { foo , bar } from "module-name/path/to/specific/un-exported/file";
import { export1 , export2 as alias2 } from "module-name";
import defaultExport, { export1 } from "module-name";
import defaultExport, * as name from "module-name";
import "module-name";
const module = await import("module-name");';
$subst = "const $1$2$3 = require($4)";
$result = preg_replace($re, $subst, $str);
echo "The result of the substitution is ".$result;
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php