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Re:Regexper – Regular expressions visualizer by ken on Friday February 02, 2018 @11:41AM (#16291900)
I'm familiar with that program, but I see no railroad diagrams there.
Re:Regexper – Regular expressions visualizer by ghusbands on Saturday February 03, 2018 @02:25PM (#16299076)
They're replying to the "convert" part, which regexbuddy does [1]

[1] https://www.regexbuddy.com/convert.html