can anyone help me or tell me if this is possible.

is there any way i can search a string lets say:

"this is a string <url> www.vb-world.net </url> this is a string"

and return the value between the <url> </url> tags?

what if there were no space like this:
"<url>www.vb-world.net<url>"

any help woudl be greatly appreciated.

thanks