I'm using a regExp in my project but some how I'm getting some undesirable characters

my RegExp looks like this:

```
new RegExp("[א-ת,A-z,',','(',')','.','-',''']");

```

which supposed to avoid characters like \ or [] 

but let my use one and more from (,),-,alphabets etc.

Unfortunately it doesnt happen 

Which pattren includes both desirable and undesirable characters??

thanks for your help