backspace     = "|\b."
tab           = "|\t."
newline       = "|\n."
formfeed      = "|\f."
carriage      = "|\r."
quote         = "|\"."
backslash     = "|\\."
delete        = "|\u007F."
unitseparator = "|\u001F."

# \u is escaped, so should NOT be interperted as a \u escape.
notunicode1   = "|\\u."
notunicode2   = "|\u005Cu."
notunicode3   = "|\\u0075."
notunicode4   = "|\\\u0075."