I will appreciate your help on validation reg expression for relative URL.

our application has a text box for entering relative url : e.g /mystore/product/querystring?=aaaa

The following conditions apply:

1. should begin with "/"

2. after first "/", if there is no subsequent "/", ?= et should be allowed

3. if there are more "/" after first "/", between 2 subsequent "/",no special chars should be allowed(like windows restrictions on folder names)