What program is there to interactively compose a state machine (regular expression)?

Question

Automation

Hello. There is text. You need to get a finite state machine (regular expression), which, preferably, can be connected to a Java program, and it could produce the desired text. At the input, we interactively (using the mouse, for example) select in the text those parts that we need, as well as those that are not needed.
What programs are there for this?

Answer 1

Solution -- RegexMagic

Answer 2

I didn’t understand anything ... What do you call "automatic"?