Question

I made an application in which I can get a field’s value through a regular expression with the help of a matcher… I made a method in which I pass a field and get a response. In string today I got some odd behaviour in my response I got AgentId = 25001220052805950 and after matcher I got fake so I have to check whether a field whose name contains “AgentId” exists and verify the values.

Needed Fields:
SecondaryAgentId=fake; PrimaryAgentId=fake;

Responce :

IsPrimaryAgentId=true; AgentId=25001220052805950; MerchantID=19; Cashier=michael; IsManualPayment=1; UserID=GraceRose; Password=rose1234; AmountUserEntered=2; AmountApproved=0; AmountDifference=0; Amount=0; CustomerNameAttempts=0; ProductID=Agriculture; InvoiceID=inv7443; SiteUrl=http://www.thcelink.com/index.php/shoping/checkout/step/step-1; ReturnURL=http://220.2.3:2027/Customer/Thanks.aspx; ResponseType=1; PrimaryAgentId=fake; PrimaryCurrencyCode=fake; SecondaryAgentId=fake; SecondaryCurrencyCode=fake; MerchantName=GraceRose; EmailId=[e-mail]; Query1Attempts=0; MerchantTransactionID=543; MerchantTransactionSequenceID=246; txtAmtIsVisible=false; isQuery1Executed=false; isQuery2Executed=false; Voucher=fake; Passcode=fake; Error=fake; QueryType=fake; Payer=fake; CurrencyName=fake; CurrencySymbol=fake; CustomerName=fake; EmailBody=fake; ErrorText=fake; CustomerEmailID=fake; NavigatePageValue=0; IsCustomerInsertSucess=false; IdType=fake; IdNumber=fake; AggregateAttempts=0; Voucher2=fake; PassCode2=fake; Voucher3=fake; PassCode3=fake; TransCode=0; TransactionDate=2012-06-11T12:04:52.921875+05:30; NumberInWords=fake; MerchantCompany=fake; InvoiceNumber=fake; OverPaidAmount=0; InsufficientAmount=0; OverPaymentForEmail=fake; RedirectPage=false; 

Update::

private String GetString1(String strManualproResponce2, String paternField) {
        // TODO Auto-generated method stub
        String s = null;
        if(paternField.equalsIgnoreCase("AgentId"))
        {
            Pattern pinPattern2 = Pattern.compile("^"+paternField + "=(.*?);");
            ArrayList<String> pins2 = new ArrayList<String>();
            Matcher m2 = pinPattern2.matcher(strManualproResponce2);
            while (m2.find()) {
                pins2.add(m2.group(1));
                s = m2.group(1);
            }
        }else
        {
        Pattern pinPattern2 = Pattern.compile(paternField + "=(.*?);");
        ArrayList<String> pins2 = new ArrayList<String>();
        Matcher m2 = pinPattern2.matcher(strManualproResponce2);
        while (m2.find()) {
            pins2.add(m2.group(1));
            s = m2.group(1);
        }
        }

        return s;
    }

Answer 1

Your question is a little bit cryptic, from what I am understanding is that the code is not working for when you would like to match/extract the value for the AgentId field. The issue seems to be with your regular expression: "^"+paternField + "=(.*?);" assumes that the text AgentId will be at the beginning of your string, which is not since at the beginning of your string you have IsPrimaryAgentId.

Also, your current regex will return true both for IsPrimaryAgentId and AgentId since they both contain the substring: AgentId. To fix this, you can either use this regex: \\s+AgentId=(.*?);, this will require a white space before the AgentId text.

Another option would be (if your AgentId will always be numerical) to use this: AgentId=(\\d+);.