Invalid perl syntax should not result in failure when #strictFeatures
isn't enabled.

-- schema.json --
{
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "pattern": "^(?![ \\t\\n]*\\(default(.*)\\))[\\s\\S]*"
}
-- out/decode/extract --
@jsonschema(schema="https://json-schema.org/draft/2020-12/schema")

_
