Escaping syntax not working

[johanjk]

Expected Behavior

Escaping syntax as described in the docs should be supported.

• Verbatim contexts within ' should not give error.
• ' character, represented as '' within a verbatim context should be allowed.

Steps to Reproduce the Problem

{
  "helloWorld": "Hello! '{Isn''t}' this a wonderful day?"
}

Gives: Error: Unbalanced right delimiter found in string

Or:

{
  "helloWorld": "Hello!' {Isn''t}' this a wonderful day?"
}

Gives "{Isn''t}" is not a valid placeholder name.

[mosuem]

Thanks for filing this! The ICU MessageFormat syntax also specifies the escaping behavior.