I have an input textbox, where I take user's URL for callback. I have allowed only certain characters in URL for security purpose.
I want to tell use about these allowed characters, but I am not getting any proper way to do so. As you can see in the image having comma separated characters in not properly visible and understandable.
Any suggestions, how I can show this to user.
Thanks in advance :)
P.S. : I am new to this site, so had confusions about tags. Please correct, if any re-tag needed.