Restrict text field from keying certain characters by user

Dear All,

We have designed dynamic legal forms and created barcodes for the same at the end of page separately. To make user friendly, we need to restrict the form field by keying unwanted characters by the user because the barcode cannot accept certain special characters it shows error.

For example, in name field the user can able to key only alphabets in addition to apostrophe and hyphen. NOT other special characters such as "\[:;<?!~

which is similar to keying alphabetic characters in numeric field.

Thanks,

Rangesh