JSON matcher is not working as expected with pattern expanders

[norberttech]

In project I'm currently working on, we had a following scenario step:

    And json response should match:
    """
    {
      "limit": 10,
      "offset": 0,
      "count": 1,
      "wins": @[email protected](1)
    }
    """

and it was throwing me a very weird error: Type pattern "@array@" is not supported by TextMatcher. (RuntimeException).
After investigation it turned out that php-matcher/src/Matcher/Pattern/Assert/Json.php:33 can't recognize this pattern as a valid json value (because of @[email protected](1)) and thats why JSONExpander is being ignored.
The same problem seems to be found here: #83

Perfect solution would be to update Json::transformPattern($pattern) method, to transform patterns with expanders into native strings:

before transformation:
@[email protected](1)

after transformation:
"@[email protected](1)"

Of course currently this issue can be solved by making sure that all patterns with expanders are stored just like in following example:

    And json response should match:
    """
    {
      "limit": 10,
      "offset": 0,
      "count": 1,
      "wins": "@[email protected](1)"
    }
    """

[smilesrg]

+1