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<?php var_dump(preg_match("/^(?:%[[:xdigit:]]{2}|[A-Za-z0-9-_.!~*'()\[\];\/?:@&=+$,])*$/", '<?xml version="1.0" encoding="UTF-8"?> <IntlRateV2Request USERID="814VALLE4779"><Revision>2</Revision><Package ID="0"><Pounds>3</Pounds><Ounces>6.4</Ounces><MailType>Package</MailType><ValueOfContents>15.87</ValueOfContents><Country>Romania</Country><Container>RECTANGULAR</Container><Size>REGULAR</Size><Width/><Length/><Height/><Girth/><ExtraServices><ExtraService>1</ExtraService></ExtraServices></Package><Package ID="1"><Pounds>55</Pounds><Ounces>0</Ounces><MailType>Package</MailType><ValueOfContents>450.99</ValueOfContents><Country>Romania</Country><Container>RECTANGULAR</Container><Size>REGULAR</Size><Width/><Length/><Height/><Girth/><ExtraServices><ExtraService>1</ExtraService></ExtraServices></Package></IntlRateV2Request>', $matches)); var_dump($matches);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
int(0) array(0) { }

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