How to write a regular expression for a xml file

[manidandu]

I need to mask data for fields values of <ab:Nm>, <ab:StrtNm>, <ab:PstCd>, <ab:TwnNm>, <ab:CtrySubDvsn>, <ab:Ctry>,  <ab:Ustrd> from below events:

First Event:

<ab:Dbtr>
<ab:Nm>ACB L OESGT AGBDH</ab:Nm>
<ab:PstlAdr>
<ab:StrtNm>12345 BELBON WAY</ab:StrtNm>
<ab:PstCd>45352-1242</ab:PstCd>
<ab:TwnNm>CUBA TWP</ab:TwnNm>
<ab:CtrySubDvsn>AB</ab:CtrySubDvsn>
<ab:Ctry>CD</ab:Ctry>
</ab:PstlAdr>
</ab:Dbtr>
<ab:RmtInf>
<ab:Ustrd>happy birthday 💖</ab:Ustrd>
</ab:RmtInf>

Second Event:

<ab:Dbtr>
<ab:Nm>AMIRA S ELHASSAN</ab:Nm>
<ab:PstlAdr>
<ab:StrtNm>5267 APHEG DR</ab:StrtNm>
<ab:PstCd>54672-1080</ab:PstCd>
<ab:TwnNm>ANTARTICA BEACH</ab:TwnNm>
<ab:CtrySubDvsn>EF</ab:CtrySubDvsn>
<ab:Ctry>CD</ab:Ctry>
</ab:PstlAdr>
</ab:Dbtr>
<ab:RmtInf>
<ab:Ustrd>happy birthday, birthday party on me</ab:Ustrd>
</ab:RmtInf>

Third event:
<ab:Dbtr>
<ab:Nm>ALYSSA FOSTER</ab:Nm>
<ab:PstlAdr>
<ab:StrtNm>529833 PRIME BILL CT</ab:StrtNm>
<ab:PstCd>45673-8297</ab:PstCd>
<ab:TwnNm>BEDERICK</ab:TwnNm>
<ab:CtrySubDvsn>MD</ab:CtrySubDvsn>
<ab:Ctry>CD</ab:Ctry>
</ab:PstlAdr>
</ab:Dbtr>
<ab:RmtInf>
<ab:Ustrd>happy birthday my love, have fun.</ab:Ustrd>
</ab:RmtInf>

Can someone help me with the regex? 

[ITWhisperer · Accepted solution]

<ab:Nm>(?<Nm>[^<]+)<\/ab:Nm>

Repeat for each tag

[manidandu]

Thanks for your help @ITWhisperer .. To mask these field values I can use sedcmd as below right?

SEDCMD-Test = s/<ab:Nm>(?<Nm>[^<]+)/<ab:Nm>########/g

Expected Output:

<ab:Nm>########</ab:Nm>