Single Backslag not able to print into field

[joaquin386]

#TargetUserName and TargetDomainName
<filter log.raw>
  @type record_modifier
  remove_keys _dummy_
  <record>
    _dummy_ ${if record['TargetUserName'] and record['TargetDomainName']; record['TargetDomainUserName'] = "${record['TargetUserName']}\${record['TargetDomainName']}"; end; nil}
  </record>
</filter>

Shows --> "TargetDomainUserName":"Hello#{record['TargetDomainName']}"

"${record['TargetUserName']}\\${record['TargetDomainName']}" 

Shows -> "TargetDomainUserName":"Hello\\World"

So there is no way to put a single backslash on the record_modifier

[zffocussss]

what is the if else syntax? is it for ruby?