Regex pattern escape is not shown in error after validation

[VityaSchel]

Steps to reproduce:

1. set rule { type: 'string', pattern: 'https:\/\/example\.com' }
2. validate incorrect string with this rule to get error
3. in error.expected will be:

{
  expected: "https://example.com"
}

instead of

{
  expected: "https:\/\/example\.com"
}

[VityaSchel]

Also works (doesn't work?), it reproduces if set new RegExp('https:\/\/example\.com') to pattern, escape slashes are not shown. If you set pattern: /https:\/\/example\.com/ then it will fail too.

[VityaSchel]

My suggestion is to use regexp object inside expected field in error or fix this issue by replacing '\' to '\\' in regex.source