$re = '/(>\\\\\${}((.*))<)/';
$str = '<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns="http://www.neustar.biz/clearinghouse/SOAPRequestHandler/1.0">
<soapenv:Header/>
<soapenv:Body>
<ns:processSync soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<in0 xs:type="type:string" xmlns:xs="http://www.w3.org/2000/XMLSchema-instance"><![CDATA[<?xml version="1.0" encoding="UTF-8"?><header>
<Request value="SOARequest"/>
<Subrequest value="SvCreateRequest"/>
<CustomerIdentifier value="PAT_TST"/>
<Supplier value="NEUSTAR"/>
<InterfaceVersion value="1_0"/>
<UserIdentifier value="example"/>
<UserPassword value="example"/>
<ApplyBusinessRules value="Y"/>
<Action value="submit"/>
</header>]]></in0>
<in1 xs:type="type:string" xmlns:xs="http://www.w3.org/2000/XMLSchema-instance"><![CDATA[<?xml version="1.0" encoding="UTF-8"?><SOAMessage>
<UpstreamToSOA>
<UpstreamToSOAHeader>
<InitSPID value="XS11"/>
<OID value="242424249"/>
<DateSent value="06-19-2017-080000AM"/>
<SvType value= "Wireline"/>
<Action value="submit"/>
</UpstreamToSOAHeader>
<UpstreamToSOABody>
<SvCreateRequest>
<Subscription>
<Tn value=${Tn}/>
</Subscription>
<LnpType value="lspp"/>
<Lrn value="4444787878"/>
<NewSP value="XS11"/>
<AccountId value="09040820157163815095"/>
<AccountName value="HIMANSHUTHKNMUAWVF"/>
<OldSP value="XS22"/>
<SvType value="Wireline"/>
<MMSURI value="-"/>
<NewSPDueDate value="11-29-2017-1100PM"/>
<PortToOriginal value="0"/>
</SvCreateRequest>
</UpstreamToSOABody>
</UpstreamToSOA>
</SOAMessage>]]></in1>
</ns:processSync>
</soapenv:Body>
</soapenv:Envelope>';
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