Validate that a URL begins with

Question

I do not find anyway that you can validate a valid url when the user enters in the standard page so I come up with this validation and I need little help to fix it.

I'm using BEGINS to see if the url starts with HTTP or HTTPs

My scenario is,

--Validation should ONLY fire when Attachment == false
-- When the users enters the URL make sure the URL starts with http:// or https://

Attempted:

if(Attachment__c == false && NOT(ISBLANK(url__c), true (BEGINS(URL__c, "https://")))

Answer 1

Try this:

AND(
    Attachment__c == false,
    NOT(ISBLANK(URL__c)),
    NOT(BEGINS(URL__c, "https://")),
    NOT(BEGINS(URL__c, "http://"))
)

You don't typically need an IF statement for a validation rule. A validation rule is basically the conditional portion of the IF statement and returns true or false based on the conditional. True means display the error, false means do not display the error.

Answer 2

Perhaps, only validation for the URL starting with "http" would be enough:

NOT(
 OR(Attachment__c,
 ISBLANK(URL__c),
 BEGINS(LOWER(URL__c, "http"))
)