How to create a validator that checks the beginning of a link?

Question

Angular

Hello, the task is to create an input in which a link to an image is entered. How to create a validator that checks the beginning of a link for http:// ? Everything is written through reactive forms. Please tell me how..

addressIcon: new FormControl('', [Validators.required, Validators.(Что тут должно быть??) ]),

Answer 1

addressIcon: new FormControl('', [Validators.required, Validators.pattern('https?:\/\/(www\.)?[[email protected]:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)') ]),

Answer 2

Thank you very much) Here is my working version: I
Validators.pattern(['http://.+'] ['https://.+'])
just check that http is in the beginning. Thanks again)