How to get url from the description in a cell to be copied to another cell.

Hi,
If suppose we have 2 columns A and B. In the column 'A' we have some data in the form of paragraphs. Each and every paragraph consists of a url (for example: www.google.com). Now i need the formula which is used to get the url from column A and paste it in the corresponding cells of column 'B'.

Please help me with this.....

Thanks & Regards,
Rajesh.............