@ ProgramNode (location: (1,0)-(1,17))
├── flags: ∅
├── locals: []
└── statements:
    @ StatementsNode (location: (1,0)-(1,17))
    ├── flags: ∅
    └── body: (length: 1)
        └── @ RegularExpressionNode (location: (1,0)-(1,17))
            ├── flags: newline, static_literal, forced_us_ascii_encoding
            ├── opening_loc: (1,0)-(1,1) = "/"
            ├── content_loc: (1,1)-(1,16) = "[\\u0021-\\u0027]"
            ├── closing_loc: (1,16)-(1,17) = "/"
            └── unescaped: "[\\u0021-\\u0027]"
