Add validation option to text input

[viktoraronfarkas]

Add a custom regex validation option to the text type filter.
For example
{ keys: ["title", "themes"], title: "Search", type: "text", placeholder: "Type Something...", expanded: true, validation: { pattern: /^[a-z\d]{5,12}$/i, message: "Must be between 5 and 12 characters long!", } },