<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/71628>71628</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            llvm-cov show: -include-filename-regex counterpart for -ignore-filename-regex flag
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          Viranchee
      </td>
    </tr>
</table>

<pre>
    Hi,
I am having a use case where I want to show code coverage for only a certain files of the program. 
By far, my solution regex has been hacky:

To include only folders that start with SIL:

```
llvm-cov show ...
  -ignore-filename-regex [A-RT-Z].* # includes only files starting with S
  -ignore-filename-regex S[A-HJ-Z].* # includes files starting with SI
  -ignore-filename-regex SI[A-KM-Z].* # includes files starting with SIL
```

If there is a counterpart flag for this, it would be wonderful

```
llvm-cov show ...
 -include-filename-regex SIL.* # includes only files starting with SIL
```

I am willing to contribute to this as well.
This can be a good first issue. This is code for -ignore-filename-regex
[CodeCoverage.cpp](https://github.com/llvm/llvm-project/blob/main/llvm/tools/llvm-cov/CodeCoverage.cpp#L897)
</pre>
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