Replace partial text string in SQL Text field

Even though this is very simple, I thought of blogging this.

I had a table called tbl_Item which had a Field called URL(nvarchar(200)) having several records like
http://192.168.0.20:8080/Items/T-shirt.jpg,
http://192.168.0.20:8080/Items/Jean.jpg.

I wanted to replace the part of the string which contains 192.168.0.20:8080 to 10.20.10.71. Here it goes.

UPDATE tbl_Item
SET Url = replace(cast(Url as NVARCHAR(200)),'192.168.0.20:8080','10.20.10.71')