---input---
"\""
"\\"
"\/"
"\b"
"\f"
"\n"
"\r"
"\t"
"\u0123"
"\u4567"
"\u89ab"
"\ucdef"
"\uABCD"
"\uEF01"

// Incomplete sequences
"\uz"
"\u1z"
"\u12z"
"\u123z"

---tokens---
'"\\""'       Literal.String.Double
'\n'          Text.Whitespace

'"\\\\"'      Literal.String.Double
'\n'          Text.Whitespace

'"\\/"'       Literal.String.Double
'\n'          Text.Whitespace

'"\\b"'       Literal.String.Double
'\n'          Text.Whitespace

'"\\f"'       Literal.String.Double
'\n'          Text.Whitespace

'"\\n"'       Literal.String.Double
'\n'          Text.Whitespace

'"\\r"'       Literal.String.Double
'\n'          Text.Whitespace

'"\\t"'       Literal.String.Double
'\n'          Text.Whitespace

'"\\u0123"'   Literal.String.Double
'\n'          Text.Whitespace

'"\\u4567"'   Literal.String.Double
'\n'          Text.Whitespace

'"\\u89ab"'   Literal.String.Double
'\n'          Text.Whitespace

'"\\ucdef"'   Literal.String.Double
'\n'          Text.Whitespace

'"\\uABCD"'   Literal.String.Double
'\n'          Text.Whitespace

'"\\uEF01"'   Literal.String.Double
'\n\n'        Text.Whitespace

'// Incomplete sequences' Comment.Single
'\n'          Text.Whitespace

'"\\uz"'      Literal.String.Double
'\n'          Text.Whitespace

'"\\u1z"'     Literal.String.Double
'\n'          Text.Whitespace

'"\\u12z"'    Literal.String.Double
'\n'          Text.Whitespace

'"\\u123z"'   Literal.String.Double
'\n'          Text.Whitespace