URLs contain vs URLs contains

Some examples from the web:

• Key server URLs may not contain whitespace.
• Opensearch is not supported by %1, you will need to enter the search URL manually. The URL should contain {searchTerms}, ktorrent will replace this by the thing you are searching for.
• This field should contain the web site URL of the lead author.
• The selected URL cannot be verified because it contains a password. Sending this URL to %1 would put the security of %2 at risk.
• The URL %1 does not contain {searchTerms}.
• A path can be relative and can contain"." or"...". This is not possible for URLs which are always absolute.
• Vcard A Vcard, which is a standard file format for electronic business cards, can contain names, addresses, phone numbers, URLs, logos, photographs, and audio clips.
• This feature only ignores regular text when you have clicked on the Expert Mode icon. If the Expert Mode is not used then the text file must contain only & URL;'s.

Some examples from the web:

• Key server URLs may not contain whitespace.
• Opensearch is not supported by %1, you will need to enter the search URL manually. The URL should contain {searchTerms}, ktorrent will replace this by the thing you are searching for.
• This field should contain the web site URL of the lead author.
• The selected URL cannot be verified because it contains a password. Sending this URL to %1 would put the security of %2 at risk.
• The URL %1 does not contain {searchTerms}.
• A path can be relative and can contain"." or"...". This is not possible for URLs which are always absolute.
• Vcard A Vcard, which is a standard file format for electronic business cards, can contain names, addresses, phone numbers, URLs, logos, photographs, and audio clips.
• This feature only ignores regular text when you have clicked on the Expert Mode icon. If the Expert Mode is not used then the text file must contain only & URL;'s.