$re = '/^msgid ""\r?\n([\s\S]*?)\r?\n(?=^msgstr ""\r?\n?)/m';
$str = '#: apps/catalogue/abstract_models.py:206
msgid ""
"Universal Product Code (UPC) is an identifier for a product which is not "
"specific to a particular supplier. Eg an ISBN for a book."
msgstr ""
#: apps/catalogue/abstract_models.py:213
#: templates/oscar/dashboard/catalogue/product_list.html:87
#: templates/oscar/dashboard/catalogue/product_update.html:168
#: templates/oscar/dashboard/catalogue/product_update.html:190
msgid "Parent"
msgstr "والد"
#: apps/catalogue/abstract_models.py:214
msgid ""
"Only choose a parent product if this is a \'variant\' of a canonical "
"catalogue. For example if this is a size 4 of a particular t-shirt. Leave "
"blank if this is a CANONICAL PRODUCT (ie there is only one version of this "
"product)."
msgstr ""';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($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