how to format a string search

[tiamat2012]

Basically I'm doing a form validation, and allowing certain characters (that my client requested). Because he wants "s, -s and such, I've tried to use HTML entities, but its only working on the ampersand.

I've never learned the structure of how to write these and just picked it up and tried to edit them, and I don't know the name of what type of formatting it is so I don't know where to learn. Can anyone help me?

[blue]
var charpos = objValue.value.search("[^A-Za-z0-9\  &"-$.,'!#?()]");[/blue] 
              if(objValue.value.length > 0 &&  charpos >= 0) 
              { 
               if(!strError || strError.length ==0) 
                { 
                  strError = objValue.name+": Only alpha-numeric characters allowed "; 
                }//if 
                alert(strError + "\n [Error character position " + eval(charpos+1)+"]"); 
                return false; 
              }//if 
              break;

Sincerely,
Kerry

 

[robherc]

Can you post the HTML code for your form here please? If you do, I think I'll be able to edit/fix that JavaScript code for you.


I hope this helps;
Rob Hercules

 

[tiamat2012]

Oh, thank you! I figured it out after that, however, and found out it was <i>regular expression</i>.

I would still like to learn more about them as the tutorial I did wasn't the best, but allowed me to fix the problem I had, but I still don't feel comfortable with it, so if you have a place I could learn that would be great.

This is the code that ended up working:

var charpos = objValue.value.search("[^A-Za-z0-9\042\046\047\055\057\ $.,!#?()]");

Thank you very much,
Kerry

 

[robherc]

I always recommend

http://www.webmonkey.com

for html/css/javascript/smle tutorials, they're the best I've found.




I hope this helps;
Rob Hercules