MyBB Community Forums

Hey everyone

I have been having this frustrating problem that has been causing my new forum to stop users to register a new account because of the following: 

On my forum I did add a custom profile field to add an image to their profile to use as a header (like on facebook or twitter). I set the custom profile field up the following:

Also I have set the regular expression to: '|^https?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$|i'
so that only a url can be entered

But now my problem is when someone tries to register a new account the following happens:
> You can not see the profile field
> Error happens: field not entered correctly

Here is a screenshot: http://prntscr.com/bduuv4

I hope you can help me with this! Thanks!

---

Edit: I forgot to mention that I also do not want the header image field on the registration page. That's why I am completely confused because I have also set it to not show on registration but it's still giving me the error and stopping new members from registering

Try:

^$|^(https?://[a-z0-9-]+(\.[a-z0-9-]+)*(:[0-9]+)?(/[^<>'"]*)?)$

• removed pattern delimiters (MyBB concatenates the regex with its own - see https://github.com/mybb/mybb/blob/mybb_1...r.php#L588)
  
• removed i flag (assuming that was the intent - placed incorrectly), which MyBB supplies
  
• introduced a ^$|^...$ scheme to match empty values (they're always checked on registration page)
  
• escaped the dot character: \.
  
• added constraint for characters after the slash not co contain <>'" (*)
  

Things to consider:

• * You should neutralize the value when outputting it nonetheless, if possible (e.g. if you are using a plugin you can use MyBB's internal function htmlspecialchars_uni())
  
• the regex is relatively simple, thus it doesn't take into account e.g. internationalized domain names (using non-Latin characters), and still might allow weird characters at the end. For comparison, you can look at battle-hardened @diegoperini's example at https://mathiasbynens.be/demo/url-regex