$re = '/code\/\":(?<code>[\d]+)/';
$str = '2014-10-29T19:20:36+00:00 DEBUG (7): ERP_SERVICE_CALL:POST:RESPONSE: "{/"status/":/"success/",/"code/":400,/"data/":{/"batch_id/":/"M-1331/",/"order_total/":4,/"success_total/":0,/"orders/":[{/"order_id/":/"1272749/",/"status/":/"error/",/"message/":/"order_id: 1272749 //nCode: INVALID_KEY_OR_REF//nDetails: Invalid item reference key. Item value provided: ASB-000219 //nforEach(EC_Libs-4.0.6.js:70),forEach(EC_Libs-4.0.6.js:70),restletwrapper(null$lib:4) //n[no stack trace]/",/"customer_internal_id/":/"16873/",/"customer_id/":1301051},{/"order_id/":/"1272750/",/"status/":/"error/",/"message/":/"order_id: 1272750 //nCode: INVALID_KEY_OR_REF//nDetails: Invalid item reference key. Item value provided: ASB-000219 //nforEach(EC_Libs-4.0.6.js:70),forEach(EC_Libs-4.0.6.js:70),restletwrapper(null$lib:4) //n[no stack trace]/",/"customer_internal_id/":/"16873/",/"customer_id/":1301051},{/"order_id/":/"1272751/",/"status/":/"error/",/"message/":/"order_id: 1272751 //nCode: INVALID_KEY_OR_REF//nDetails: Invalid item reference key. Item value provided: ASB-000219 //nforEach(EC_Libs-4.0.6.js:70),forEach(EC_Libs-4.0.6.js:70),restletwrapper(null$lib:4) //n[no stack trace]/",/"customer_internal_id/":/"16873/",/"customer_id/":1301051},{/"order_id/":/"1272752/",/"status/":/"error/",/"message/":/"order_id: 1272752 //nCode: INVALID_KEY_OR_REF//nDetails: Invalid item reference key. Item value provided: ASB-000219 //nforEach(EC_Libs-4.0.6.js:70),forEach(EC_Libs-4.0.6.js:70),restletwrapper(null$lib:4) //n[no stack trace]/",/"customer_internal_id/":/"16873/",/"customer_id/":1301051}]}}"';
preg_match($re, $str, $matches, PREG_OFFSET_CAPTURE, 0);
// Print the entire match result
var_dump($matches);
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