regex.tree

gistfile1.json

{"type":"match","offset":0,"text":"(a|b)","body":[
  {"type":"capture-group","offset":1,"text":"a|b","body":
    {"type":"alternate","offset":1,"text":"a|b","left":
      {"type":"match","offset":1,"text":"a","body":[
        {"type":"literal","offset":1,"text":"a","body":"a","escaped":false}
      ]},"right":
        {"type":"match","offset":3,"text":"b","body":[
          {"type":"literal","offset":3,"text":"b","body":"b","escaped":false}
        ]}
    },"index":1},
  {"type":"literal","offset":4,"text":"d","body":"d","escaped":false}
]}