How to allow only numbers letters and (.,/) in html input

Hello all,

I have a php file where i have a text input box in html.

I have the following code now that succesfully check if the input is letters or numbers.

However, I want to include . and / in the allowed characters. Can some one please help me to modify the code so that it accepts "." and "/"

Thank you.

else if( channelname.search("[^A-Za-z0-9\ ]") >= 0) {
		alert("Only characters and numbers allowed.") ;
		document.getElementById( "channelname" ).focus() ;
		return false ;

the bit you posted is not php, but you might change it like this:

else if( channelname.search("[^A-Za-z0-9\./ ]") >= 0) {

the code is javascript and i'm not sure on javascript regex syntax.

This worked. Thank you very much !