Just received the upgrade to 2023.6.0 Community Edition of Studio and it seems the Matches activity has lost the ability to launch the Regex Builder.
Previously it looked like this:
And the properties looked like this:
And now the activity looks like this:
And the properties look like this:
There is no obvious way to launch the Regex Builder. It seems unlikely that we would be expected to build a Regex expression in a different tool to bring it in here.