Check if field contains certain characters


Is it possible to check if a field contains certain characters, I thought I could use the following:

I'm checking for & , '

if(!/(\-|\&|\')$/i.test(fld.value)) {
alert("Your file contains invalid characters, please rename your file.");
return false;

Thanks in advance.
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if(/&|'/.test(fld.value)) {
   alert("Your file contains invalid characters, please rename your file.");
   return false;
return true;
sanjshah12Author Commented:
thanks leakim971,

just to check I need to ensure that &-,'/% are not contained in the filename - so I added:

      if(/&|'|-|,/.test(fld.value)) {

but don't think that I'm doing this correctly.

Instead use :

 if(/[&'\-,]/.test(fld.value)) {

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sanjshah12Author Commented:
Thanks that works!
sanjshah12Author Commented:
thanks leakim971 for the links.
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