Symfony Constraints: Regex for resolution

Question

I'm trying to validate a parameter structure that should match values like: 1200x800 , 1200x, x800 or simply x And so i'm using the following constraint:

'size' => [
                new Assert\NotBlank(),
                new Assert\Regex([
                    'pattern' => '/(\d+)?x(\d+)?/i'
                ])
            ],

The regex works fine as a standalone, but inside symfony constraint it also match cases like 1200x800x500. Im guessing behind the scene that it uses the preg_match_all? That would explain it since using: preg_match_all('/(\d+)?x(\d+)?/i', $data['size'], $size);, gives the following result:

array:3 [▼
  0 => array:2 [▼
    0 => "1500x800"
    1 => "x500"
  ]
  1 => array:2 [▼
    0 => "1500"
    1 => ""
  ]
  2 => array:2 [▼
    0 => "800"
    1 => "500"
  ]
]

Is there a way to make it stop at the first occurrence? Basically allow only: 1200x800 , 1200x, x800 or simply x

You can use word boundaries `\b(\d+)?x(\d+)?\b` See https://regex101.com/r/0dd75f/1 — The fourth bird, May 03 '21 at 10:07

score 2 · Accepted Answer · edited May 03 '21 at 10:12

2

You could set the ^ start-of-string and $ end-of-string anchors inside the regex:

/^(\d+)?x(\d+)?$/i

edited May 03 '21 at 10:12

AymDev

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answered May 03 '21 at 10:07

boppy

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Nice, that fixed it. I thought this was a symfony thing because it worked as expected in the regex fiddle. – Petru Lebada May 03 '21 at 10:26

Symfony Constraints: Regex for resolution

1 Answers1