Risheng Encoder rules

Output
  The service returns only the Pattern portion for the left side of a Perl s command.
  It does not return the replacement side, delimiter, flags, or a complete command.

Whitespace runs
  A run made only of spaces is preserved as spaces.
  Any adjacent sequence of whitespace that contains tab, line feed, or carriage return becomes:
  [\011\012\015\040]+

Literal characters
  ASCII letters and digits are preserved.
  Non-ASCII characters are preserved.

Escaped characters
  ASCII printable non-alphanumeric characters become three-digit octal escapes.
  Other ASCII control characters are also octal-escaped.

Form submission
  POST / accepts multipart/form-data with source text in field "c".
  Empty or missing "c" returns 400 Bad Request.

curl example
  cat my_target_text | curl -F "c=@-" "https://risheng-encoder-example.com/"

ASCII printable non-alphanumeric mapping
  ! -> \041
  " -> \042
  # -> \043
  $ -> \044
  % -> \045
  & -> \046
  ' -> \047
  ( -> \050
  ) -> \051
  * -> \052
  + -> \053
  , -> \054
  - -> \055
  . -> \056
  / -> \057
  : -> \072
  ; -> \073
  < -> \074
  = -> \075
  > -> \076
  ? -> \077
  @ -> \100
  [ -> \133
  \ -> \134
  ] -> \135
  ^ -> \136
  _ -> \137
  ` -> \140
  { -> \173
  | -> \174
  } -> \175
  ~ -> \176