<?php
$baseRawString = "Content-Transfer-Encoding: base64
 
DQoNCg0KDQoNCg0KDQoNCg0KDQpbQiZRXTxoadHRwOi8vd3d3LmRpeS5jb20+DQoNCg0KDQoNCg0K W2h0dHA6Ly9raW5nZmlzaGVyLnNjZW5lNy5jb20vaXMvaW1hZ2UvS2luZ2Zpc2hlci9pY29uX3N0 b3JlX2xvY2F0b3I/d2lkPTM2JmhlaT0zNiZxbHQ9MTAwXTxodHRwOi8vd3d3LmRpeS5jb20vZmlu ZC1hLXN0b3JlPg0KDQoNCg0KRmluZCBhIHN0b3JlPGh0dHA6Ly93d3cuZGl5LmNvbS9maW5kLWEt c3RvcmU+DQoNCg0KDQoNCkN1c3RvbWVyIFNlcnZpY2VzDQoNCjAzMzMgMDE0IDMzNTcNCg0KDQoN Cg0KDQoNCg0KDQoNCkluc3BpcmF0aW9uPGh0dHA6Ly93d3cuZGl5LmNvbS9pbnNwaXJhdGlvbi8w Lmlyb290Pg0KDQpQcm9qZWN0czxodHRwOi8vd3d3LmRpeS5jb20vcHJvamVjdHMvMi5wcm9vdD4N Cg0KU2hvcDxodHRwOi8vd3d3LmRpeS5jb20vc2hvcC8+DQoNCkhlbHAgJiBBZHZpY2U8aHR0cDov L3d3dy5kaXkuY29tL2hlbHAtYWR2aWNlLzEuaHJvb3Q+DQoNCk15IGFjY291bnQ8aHR0cDovL3d3 dy5kaXkuY29tL2N1c3RvbWVyL215X2FjY291bnQvPg0KDQoNCg0KDQoNCg0KDQoNCg0KRGVhciBC ZW4gUGF0b24NCg0KDQoNCg0KVGhhbmsgeW91IGZvciB5b3VyIG9yZGVyDQoNCg0KDQoNCg0KT3Jk ZXIgbnVtYmVyOg0KDQowMDYzMTA5MDU1DQoNCg0KDQpUb3RhbCBDb3N0Og0KDQrCozMuMjcNCg0K DQoNClRoYW5rIHlvdSBmb3Igb3JkZXJpbmcgZnJvbSBCJlEuIFlvdeKAmWxsIGZpbmQgZGV0YWls cyBvZiB5b3VyIG9yZGVyIGFuZCBkZWxpdmVyeSBvciBjb2xsZWN0aW9uIGluZm9ybWF0aW9uIGJl bG93LiBGb3IgaGVscCB3aXRoIHF1ZXN0aW9ucyBhYm91dCBvdXIgc2VydmljZSwgcGxlYXNlIHNl";
 
preg_match_all('/Content-Transfer-Encoding: base64\s+(.*?)$/', $baseRawString , $match, PREG_PATTERN_ORDER);
$baseString = $match[1][0];
 
echo $baseString ;

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