Pattern wrapped by double quote is showing error

[dhaval-mehta]

Sample Image

Original Issue link: encode/django-rest-framework#7204

YAML which is not throwing error:

swagger: '2.0'
info:
  description: ''
  version: 1.0.5
  title: Swagger Petstore
  termsOfService: 'http://swagger.io/terms/'
  contact:
    email: apiteam@swagger.io
  license:
    name: Apache 2.0
    url: 'http://www.apache.org/licenses/LICENSE-2.0.html'
host: petstore.swagger.io
basePath: /v2
tags:
  - name: pet
    description: Everything about your Pets
paths:
  /pet:
    post:
      tags:
        - pet
      summary: Add a new pet to the store
      description: ''
      operationId: addPet
      consumes:
        - application/json
      produces:
        - application/json
      responses:
        200:
          description: ''
          schema:
            $ref: '#/definitions/Pet'

definitions:
  Pet:
    type: object
    required:
      - name
      - photoUrls
    properties:
      id:
        type: integer
        format: int64
      name:
        type: string
        example: doggie
        pattern: '^(\d+\.)?(\d+\.)?(\*|\d+)$'
      photoUrls:
        type: array
        xml:
          wrapped: true
        items:
          type: string
          xml:
            name: photoUrl
      status:
        type: string
        description: pet status in the store
        enum:
          - available
          - pending
          - sold
    xml:
      name: Pet

Just replace single quote by double quote and error will come.

for example: '^(\d+\.)?(\d+\.)?(\*|\d+)$' => "^(\d+\.)?(\d+\.)?(\*|\d+)$"'

[hkosova]

If a string is double-quoted, inner backslashes \ need to be escaped as \\.

pattern: '^(\d+\.)?(\d+\.)?(\*|\d+)$'

# but

pattern: "^(\\d+\\.)?(\\d+\\.)?(\\*|\\d+)$"

See the "Quick Comparison" section here
http://blogs.perl.org/users/tinita/2018/03/strings-in-yaml---to-quote-or-not-to-quote.html

[dhaval-mehta]

@hkosova Thanks for a quick resolution. :)