PHPBB: how do I dis-allow website URLs from being posted?

Tons of spammers registering, I think this is why!

[uhwebs]

I have had tons of spammers/auto registrations on my phpbb forum. I would like to prevent people from putting their URLs in the 'website' part of the profile. How can I remove this? I'm hoping bots will quit registering if there is no place to advertise their sites.
Any other help is greatly appreciated...

[camweh]

I have it so that all I or any of my members see is an increase in membership numbers until I approve them using the "Admin Registration Approval" option at phpBB. In conjunction with the "Visual Confirmation Code" I have a few MODs that help they are:

1.Actual MOD name: "No Website Signature showing during registration"

2.Unsure of this MODs name but it Stop inactive members showing as newest registered member on the front page.

[buksida]

I actually removed the website bit from the registration form, stopped most of them:

templates/**/profile_add_body.tpl

-----FIND and REMOVE-----
<tr>
<td class="row1"><span class="gen">{L_WEBSITE}:</span></td>
<td class="row2">
<input type="text" class="post"style="width: 200px" name="website" size="25" maxlength="255" value="{WEBSITE}" />
</td>
</tr>

-----Save and close file-----

[Gibisan]

You'll still see some of the automated bots posting the website url field when registering. To catch these bots out you can check if the website field is filled during registration once you have removed it from the registration page as buksida suggests. If it is you know that it is an auto submission and do not have to bother processing the rest of the registration script.

[AjiNIMC]

If you need I can code for this mod. Let me know if it is not solved yet.