\n in regular expression is not working

[utsavtulsyan]

Regular Expression:
{\n "uuid": "(?<uuid>[a-f0-9\-]*)",\n},

Test String:

{
  "uuid": "abcd",
},

The above does not give correct response, while the following Regular Expression works:

{
  "uuid": "(?<uuid>[a-f0-9\-]*)",
},

[tomohiro]

These patterns are works correctly:

{\r\n.+"uuid": "(?<uuid>[a-f0-9\-]*)",\r\n},

https://fluentular.herokuapp.com/parse?regexp=%7B%5Cr%5Cn.%2B%22uuid%22%3A+%22%28%3F%3Cuuid%3E%5Ba-f0-9%5C-%5D*%29%22%2C%5Cr%5Cn%7D%2C&input=%7B%0D%0A++%22uuid%22%3A+%22abcd%22%2C%0D%0A%7D%2C&time_format=

or

{\R.+"uuid": "(?<uuid>[a-f0-9\-]*)",\R},

https://fluentular.herokuapp.com/parse?regexp=%7B%5CR.%2B%22uuid%22%3A+%22%28%3F%3Cuuid%3E%5Ba-f0-9%5C-%5D*%29%22%2C%5CR%7D%2C&input=%7B%0D%0A++%22uuid%22%3A+%22abcd%22%2C%0D%0A%7D%2C&time_format=

[utsavtulsyan]

Hi @tomohiro I was testing this on rubular and my regex worked correctly without \r, would you help me understand the difference between the two.