$var = 'Please enter Certificate Signing Request(CSR): Press <Enter> w
+hen done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Signed Certificate: :
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----'
Require a regex to match and obtain the complete string after "-----BEGIN CERTIFICATE-----" and before "-----END CERTIFICATE-----"
if ($var =~ /Signed(.*)\s+(.*)\s+(.*)/) {
print"$3\n";
}