Is there a way to ensure that special characters are not entered in a single line text field

[Cupcake]

I have a variable that is a single line text field. The customer wants to ensure that these conditions are met. Is there a way to accomplish this?

Must NOT contain the following printable characters: / : \ ~ & % ; @ ' " ? < > | # $ * } { , + = [ ].
Must NOT start with an underscore (_).

Thanks,

Karen

[Rajesh Mushke]

Hey Kbrownibx,

did you tried with Regular expression? 

Let me know if you need more help

Thanks,

Rajashekhar Mushke

Community Leader - 18

[Shane J]

This looks like a good example:

https://stackoverflow.com/questions/11896599/javascript-code-to-check-special-characters

[Cupcake]

Hey Shane,

    I am trying this and I keep getting a Java console error and I am not sure why. Here is how I have the script.

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
var iChars = "~`!#$%^&*+=-[]\\\';,/{}|\":<>?";
if(!iChars.test(/\W/g)){
alert ("File name has special characters ~`!#$%^&*+=-[]\\\';,/{}|\":<>? \nThese are not allowed\n");
return false;
}
}

Thanks Karen.

[Shane J]

I started from scratch based on the link I gave.  This seems to work for me ( nospecial being the name of the String variable I used):

function onChange(control, oldValue, newValue, isLoading) {
   if (isLoading || newValue == '') {
      return;
   }

var nospec = g_form.getValue('nospecial');
var pattern = new RegExp(/[~`!#$%\^&*+=\-\[\]\\';,/{}|\\":<>\?]/); //unacceptable chars
if (pattern.test(nospec)){
	alert("No special characters!");
	return false;
}
	return true;

   
}

Note this doesn't help with the underscore piece.