regex for validating password
This regex can be use to validate password
((?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[\W]).{8,20})
description:
( # Start of group
(?=.*\d) # must contains one digit from 0-9
(?=.*[a-z]) # must contains one lowercase characters
(?=.*[\W]) # must contains at least one special character
. # match anything with previous condition checking
{8,20} # length at least 8 characters and maximum of 20
) # End of group
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