DataWeave 2.0 反斜杠转义

Question

How can you get a single backslash in DataWeave 2.0?

%dw 2.0
output application/json
---
{
  "attempt1": "\String",
  "attempt2": "\\String"
}

Returns:

{
  "attempt1": "\\String",
  "attempt2": "\\String"
}

Answer 1

Looks like your output is a json and in json the \\ always need to be escaped inside a string. That is why you are always going to see two \\

Answer 2

It appears it will always resolve to an even number if the output is in json like @machaval has said.

Tweaking mulesoft documentation: https://docs.mulesoft.com/mule-runtime/4.1/dataweave-language-introduction#examples

%dw 2.0
output application/json
---
{
    "a": "something",
    "b": "dollar sign (\$)",
    "c": 'single quote (\')',
    "c": "double quote (\")",
    "e": 'backtick (`)',
    "f": "backslash(\)",
    "g": "backslashOdd(\\\)",
    "h": "backslashEven(\\\\\\)"
}

produces:

{
  "a": "something",
  "b": "dollar sign ($)",
  "c": "single quote (')",
  "c": "double quote (\")",
  "e": "backtick (`)",
  "f": "backslash(\\)",
  "g": "backslashOdd(\\)",
  "h": "backslashEven(\\\\)"
}

Favoriting this question in case you get a better answer. I think I ended up using toString().replace() in the past