Replace exact matching string in xml string using java -

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i read many articles regex replace string in xml value. in many articles of peoples accepted answers 

str=str.replaceall("\\b2017\\b", "****");

but not working expected , replacing 2017 in other place also. below example.

public class stringtest {      public static void main(string[] args) {         string str=                 "<ota_insurancebookrq xmlns=\"http://www.opentravel.org/ota/2003/05\" version=\"2.001\">                        "+                         "  <pos>                        "+                         "    <source>                       "+                         "      <tpa_extensions>                     "+                         "        <productcode>101468</productcode>                      "+                         "        <purchasedate>2017-08-21</purchasedate>                        "+                         "        <transactiontype>purchase</transactiontype>                        "+                         "        <submissiontype>merchantxmlpurchase</submissiontype>                       "+                         "      </tpa_extensions>                        "+                         "    </source>                      "+                         "  </pos>                       "+                         "  <planforbookrq planid=\"245235\">                        "+                         "    <inscoveragedetail>                        "+                         "      <coveredtrips>                       "+                         "        <coveredtrip depositdate=\"2017-08-11t00:00:00.000z\" end=\"2017-09-03\" finalpaydate=\"2017-08-14t00:00:00.000z\" start=\"2017-09-02\">                       "+                         "          <destinations>                       "+                         "            <destination>                      "+                         "              <stateprov/>                     "+                         "              <countryname>germany</countryname>                       "+                         "            </destination>                     "+                         "          </destinations>                      "+                         "          <operators>                      "+                         "            <operator companyshortname=\"delta\" travelsector=\"airline\"/>                        "+                         "            <operator companyshortname=\"carnival\" travelsector=\"cruiseline\"/>                      "+                         "          </operators>                     "+                         "        </coveredtrip>                     "+                         "      </coveredtrips>                      "+                         "    </inscoveragedetail>                       "+                         "    <insurancecustomer>                        "+                         "      <paymentform costcenterid=\"online\" guaranteeid=\"243356\" rph=\"\" remark=\"customerconfirmation@email.com\">                      "+                         "        <paymentcard expiredate=\"2017\">                      "+                         "          <cardtype code=\"visa\"/>                        "+                         "          <cardholdername>test booking</cardholdername>                        "+                         "          <telephone phonenumber=\"1234567890\"/>                      "+                         "          <email>errorreporting@email.com</email>                      "+                         "          <cardnumber encryptedvalue=\"4111111111111111\"/>                        "+                         "          <seriescode encryptedvalue=\"agent sold policy\"/>                       "+                         "        </paymentcard>                     "+                         "      </paymentform>                       "+                         "    </insurancecustomer>                       "+                         "  </planforbookrq>                     "+                         "</ota_insurancebookrq>";                    str=str.replaceall("\\b2017\\b", "****");         system.out.println(str);     }  }

when ran program expected result <paymentcard expiredate="2017"> should replace <paymentcard expiredate="****"> along replacing 2017 value in <purchasedate>2017-08-21</purchasedate> <purchasedate>****-08-21</purchasedate> not acceptable in case.

i tried below regex no luck.

str=str.replaceall("(?<!\\s)2017(?!\\s)", "****");

please not mark , close duplicate since no answers working expected.

if you're trying replace "2017" in quotes, explicitly:

str = str.replace("\"2017\"", "\"****\"");




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