Answer / Rajat Shrivastav

In Splunk, extraction of fields can be achieved using Field Extraction Transforms (FET), which are used to create new fields or modify existing ones. FETs can be defined within a Splunk app or in the prop.conf file. The process involves specifying patterns for matching and transformation rules. Here's an example of a simple FET for extracting a field named 'UserName':

```
[field:: UserName]
REGEX = "(?<=<USERNAME>)[^<]+(?=</USERNAME>)";
```

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