nl_tokens: Checks whether the given string has \ u { 90ABCDEF } - like escapes .
pl_tokens: function hasUnicodeCodePointEscape ( raw ) { let <mask> = null UNICODE_ESC . lastIndex = 0 while ( ( match = UNICODE_ESC . exec ( raw ) ) != null ) { if ( match [ 1 ] . length % 2 === 1 ) { return true } } return false }