@ ProgramNode (location: (1,0)-(1,5))
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,5))
    └── body: (length: 1)
        └── @ RegularExpressionNode (location: (1,0)-(1,5))
            ├── flags: extended, forced_us_ascii_encoding
            ├── opening_loc: (1,0)-(1,1) = "/"
            ├── content_loc: (1,1)-(1,3) = "#)"
            ├── closing_loc: (1,3)-(1,5) = "/x"
            └── unescaped: "#)"