I need to validate the criteria in a password: Must contain at least one capital letter, one lowercase and one or more numbers, the size must be between 6 and 32 characters, can not have any special character or space. Must have all 3 types: Uppercase, lowercase and number. I have tried several way…

Iterate the string, count the used characters per group and compare against your threshlds.

Like @NobbZ pointed out, using a regular expression is not ideal in this situation. It will obfuscate what you’re actually doing, might introduce obscure bugs and you won’t be able to give meaningful error messages.

Okay, I’ll implement it cleaner, anyway I wanted to explore more regex in Elixir, but thanks.

Here’s an implementation that doesn’t use regex, but it’s kind of ugly: defmodule PasswordValidator do @valid_upper 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' @valid_lower 'abcdefghijklmnopqrstuvwxyz' @valid_num '0123456789' def validate(pass) do chars = pass |> String.to_charlist() …

Or using my ExSpirit parsing library (untested but should be close enough: defmodule PasswordValidator do use ExSpirit.Parser, text: true def validate(pass) do case parse(pass, valid_chars()) do %{error: nil, rest: ""} -> :ok %{error: nil} -> {:error, "Password is too long, kee…

@ajoao or anyone else interested in this. Partially inspired by this thread (and the fact that there didn’t appear to be any password validators or checkers on hex) I’ve created a simple password validator library: [image] password_validator A library to validate passwords, with built-i…

[image] axelson: Please feel free to check it out and give me any feedback (including on the code structure). I’ll probably try to do some sort of larger forum post in the near future but wanted to mention it here first. Cool. You could also replace the functionality of this password strengt…

Yeah that would be a great next step! :wink: But actually that led me to zxcvbn which is an entropy-based checker. That would be interesting to tackle and is currently missing an Elixir implementation. Also I am agreed that validating based on types of characters is not very useful (but I really ju…

Elixir Programming Language Forum

Groups in regex to validate password

Questions & Help Questions

ajoao July 22, 2017, 10:38am 3

In a single regex would not it be possible? If so, would you have an example?