---input---
"\\"
{{\\}}
"\a"
{{\a}}
"\b"
{{\b}}
"\n"
{{\n}}
"\r"
{{\r}}
"\t"
{{\t}}
"\""
{{\"}}
"\012"
{{\012}}
"\345"
{{\345}}
"\67"
{{\67}}

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

'{{'          Literal.String
'\\\\'        Literal.String.Escape
'}}'          Literal.String
'\n'          Text.Whitespace

'"'           Literal.String
'\\a'         Literal.String.Escape
'"'           Literal.String
'\n'          Text.Whitespace

'{{'          Literal.String
'\\a'         Literal.String.Escape
'}}'          Literal.String
'\n'          Text.Whitespace

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

'{{'          Literal.String
'\\b'         Literal.String.Escape
'}}'          Literal.String
'\n'          Text.Whitespace

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

'{{'          Literal.String
'\\n'         Literal.String.Escape
'}}'          Literal.String
'\n'          Text.Whitespace

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

'{{'          Literal.String
'\\r'         Literal.String.Escape
'}}'          Literal.String
'\n'          Text.Whitespace

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

'{{'          Literal.String
'\\t'         Literal.String.Escape
'}}'          Literal.String
'\n'          Text.Whitespace

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

'{{'          Literal.String
'\\"'         Literal.String.Escape
'}}'          Literal.String
'\n'          Text.Whitespace

'"'           Literal.String
'\\012'       Literal.String.Escape
'"'           Literal.String
'\n'          Text.Whitespace

'{{'          Literal.String
'\\012'       Literal.String.Escape
'}}'          Literal.String
'\n'          Text.Whitespace

'"'           Literal.String
'\\345'       Literal.String.Escape
'"'           Literal.String
'\n'          Text.Whitespace

'{{'          Literal.String
'\\345'       Literal.String.Escape
'}}'          Literal.String
'\n'          Text.Whitespace

'"'           Literal.String
'\\67'        Literal.String.Escape
'"'           Literal.String
'\n'          Text.Whitespace

'{{'          Literal.String
'\\67'        Literal.String.Escape
'}}'          Literal.String
'\n'          Text.Whitespace
