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For your specific example, you can do this, 
 
a="_exam@p_ (mailto:exam@p)   Le3|  
a.gsub!(/[^A-Za-z0-9]/,'')
p a
 
You can also eliminate elements you specify in an Array :
 
class Array
def  eliminate_chars_from_this_array(text)
res=self.dup
res.each{|x|  text.gsub!(Regexp.new(x),'') }
return text
end
end
 
array=["a","@","\247",","\'"]
a="_exam@p_ (mailto:exam@p)   Le3|\247'"  
a=array.eliminate_chars_from_this_array(a)
p a
 
Best regards,
 
Axel 

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