---input---
'\\ \n \x12 \777 \u1234 \U00010348 \N{Plus-Minus Sign}'

---tokens---
"'"           Literal.String.Single
'\\\\'        Literal.String.Escape
' '           Literal.String.Single
'\\n'         Literal.String.Escape
' '           Literal.String.Single
'\\x12'       Literal.String.Escape
' '           Literal.String.Single
'\\777'       Literal.String.Escape
' '           Literal.String.Single
'\\u1234'     Literal.String.Escape
' '           Literal.String.Single
'\\U00010348' Literal.String.Escape
' '           Literal.String.Single
'\\N{Plus-Minus Sign}' Literal.String.Escape
"'"           Literal.String.Single
'\n'          Text.Whitespace