I'm writing a C++ program to isolate parts of HL7 messages.
I have regex statements that I have tested on regex101's PCRE regex tester, across my sample text, which are messages such as this one:
MSH|^~\&|CERNER||PriorityHealth||||ORU^R01|Q479004375T431430612|P|2.3|
PID|||001677980||SMITH^CURTIS||19680219|M||||||||||929645156318|123456789| PD1||||1234567890^LAST^FIRST^M^^^^^NPI|
OBR|1|341856649^HNAM_ORDERID|000002006326002362|648088^Basic Metabolic Panel|||20061122151600|||||||||1620^Hooker^Robert^L||||||20061122154733|||F|||||||||||20061122140000|
OBX|1|NM|GLU^Glucose Lvl|59|mg/dL|65-99^65^99|L|||F|||20061122154733|
When I test on the tester, I receive matches such as "001677980" or "CURTIS" or "SMITH". However, when using the std::regex_match functionality, I'm getting empty strings when I loop over messages such as these. I have already checked that the messages are correctly being inserted into the messageList vector.
I am getting a correct value for regex A, but I get that same value 5 times, without changing for each message.
I have a function here:
void getBasicPatientInfo(){
for (int i = 0;i < fileCount;i++) {
std::string s(messageList[i]);
std::regex a("PID(?:[^|]*\\|){3}([^|^]*)");
std::regex b("PID(?:[^|]*\\|){5}(?:[^^]*\\^)([^|^]*)");
std::regex c("PID(?:[^|]*\\|){5}([^|^]*)");
std::smatch sma;
std::smatch smb;
std::smatch smc;
std::regex_match (s,sma,a);
std::regex_match (s,smb,b);
std::regex_match (s,smc,c);
int pID;
std::istringstream inBetween (sma[1]);
inBetween >> pID;
std::cout << pID << std::endl;
patientIDs.push_back(pID);
patientFNames.push_back(smb[1]);
patientLNames.push_back(smc[1]);
messageDates.push_back(smd[1]);
}
for (int i = 0;i < fileCount;i++) {
std::cout << patientIDs[i] << std::endl;
}
for (int i = 0;i < fileCount;i++) {
std::cout << patientFNames[i] << std::endl;
}
for (int i = 0;i < fileCount;i++) {
std::cout << patientLNames[i] << std::endl;
}
}
I'd like to know how to correctly use regex to return the parts of the message as I've tested on regex 101.
I'm inserting index 1 into the other vectors, as that is what I have seen elsewhere. Inserting index 0 into the other vectors yields the result that all 15 prints are empty.
