Clean phone numbers which has special characters and alphabets

I have junk in the phone number field and i want to clean them. I would like to know how to query to check if there are any special characters , alphabets in the phone number field. Can anyone help please? I tried this query and didn't work. I need the code in PostgreSQL select phone from table where phone like '[^[:alpha:]]' and phone <>'' -- and phone not like '[^0-9]' order by phone input value in the table looks like: Phone ----- (443)-554-6677 111-111-1111 345-rty-34fr 4345434444 ext Output(should look like this valid phone numbers) (443)-554-6677 111-111-1111 Your help is appreciated. Thank You, Swathi.