<?php
$re = "/x-csrf-token:(.*?)(?=\\w+:)/m"; 
$str = "HTTP/1.1 404 Not Foundset-cookie: test-usercontext=asdf-client=200; path=\n/set-cookie: test=AjQxMDMBABhNAEEATgBHAE8AIAAgACAAIAAgACAAIAACAAYyADAAMAADABBGAEIAVAAgACAAIAAgACAABAAYMgAwADEANgAwADQAMgA4ADEAMAAzADQABQAEAAAACAYAAlgACQACRQD\n%2fA%2fowggP2BgkqhkiG9w0BBwKgggPnMIID4wIBATELMAkGBSsOAwIaBQAwCwYJKoZIhvcNAQcBoIICwjCCAr4wggJ%21AgcgE\nwUWFQk1MAkGByqGSM44BAMwRTELMAkGA1UEBhMCREUxDzANBgNVBAoTBlNBUC1BRzEMMAoGA1UECxMDRkJUMRcwFQYDVQQDDA4qL\nndkZi5zYXAuY29ycDAeFw0xMzA1MTYxNTA5MzVaFw0zODAxMDEwMDAwMDFaMEUxCzAJBgNVBAYTAkRFMQ8wDQYDVQQKEwZTQVAtQUcxDDAKBgNVBAsTA0ZCVDEXMBUGA1UEAwwOKi53ZGYuc2FwLmNvcnAwggG4MIIBLAYHKoZIzjgEATCCAR8CgYEA\n%2f%21RvacHcYrHXGs0tkbb0V5pRZr%2166wpEefngcrA%2feo5VUyPFnjV%21VLPgYTlK5oVBT%21b8hVdVDF72%2fF7tG%2fzyNXjr6xCkACw69\n%21NEBKQ4A7RSfLieN8IgCWl3ENA6cbgQJlhYMAugQexgN5rNX67eLyIFTEHGbF%2fkvlWXyDZt2AsCFQCCZiO7z37X8dHkeMyzasFRThlyFwKBgQC6\n%2f4ZVeZJsMH528dpoLej8jEeUYstPpe6CFgIF7LqFjFnEWM%2fgt364k9%21kYRMdnN1l3Dgv2fHBOMET2lwiCSP%21Lp3JkDH9K\n%21H9zLJfg%2fd3o5gNCu4pct9Au4%2fLh%21ejlgOAytMcr7z9G1SSaRKFk9QnzfyA4mmLmtDT6qZG%2fgx5%21wOBhQACgYEA%21rGBozVMIrQFy8mXlkOSDWiAo16gBBlLqAIhsc3Th\n%2f6LFM%21HK8mzuxApdB8vDg5zOPQW959g2YmZBvMm7fBjjRyeQnh0SamBQNwdWR3cyhdXANRJTjdjV6yGJaBVUzMam5Yh2%2fNjwHWxS\n%21Ev%21KNSUi7%2fHLrYjQ%2f5mYiipmBwOskwCQYHKoZIzjgEAwMvADAsAhQkPKrX2UIzsWHZoErU9zMKRjRMSwIUchu3vWrhXc2bckO\n%21ASRCiCh3oF4xgf0wgfoCAQEwUDBFMQswCQYDVQQGEwJERTEPMA0GA1UEChMGU0FQLUFHMQwwCgYDVQQLEwNGQlQxFzAVBgNVB\nAMMDioud2RmLnNhcC5jb3JwAgcgEwUWFQk1MAkGBSsOAwIaBQCgXTAYBgkqhkiG9w0BCQMxCwYJKoZIhvcNAQcBMBwGCSqGSIb3D\nQEJBTEPFw0xNjA0MjgxMDM0NTdaMCMGCSqGSIb3DQEJBDEWBBTLTQarxV7dyga8cQOmMUBQNBc4mTAJBgcqhkjOOAQDBC4wLAIUUOp\n%21DiZu22HaQ324gaZTLbbjWqICFCtwUwws0te2HqBON0OF%2faQ%21hLD3; path=/; domain=test.de; secure; HttpOnlyset-cookie\n: asdf_SESSIONID=VMoFGADsOTEThFHqCdDaC9mG0O4NLBHmhakAUFaDZVE%3d; path=/; secure; HttpOnlycontent-type\n: application/jsoncontent-length: 504x-csrf-token: dZgtpkwUMaN-gQ1X4QEXUw==dataserviceversion: 1.0x-asdf-e2eperf\n: { asName: \"ldai1_00\", asType: \"asdf\", elapsed: 319, maxMem: 4595, dbTime: 166 }{\"error\":{\"code\"\n:\"005056A509B11EE1B9A8FEC11C21D78E\",\"message\":{\"lang\":\"en\",\"value\":\"Resource not found for the segment\n 'http:'.\"},\"innererror\":{\"transactionid\":\"5721AEEC42F83183E10000000A4DA014\",\"timestamp\":\"20160428103457\n.6579540\",\"Error_Resolution\":{\"error\",\"Note\":\"Note 1797736\n for error analysis\"}}}}<br> "; 
 
preg_match_all($re, $str, $matches);
 
print_r($matches[1]);

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