Regular Expression for Secure Password

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I need some help to be able to include in the regular expression I’m using to not allow spaces.

The password must meet the following requirements:

  • Have at least 1 number;
  • At least 1 capital letter;
  • Has at least 1 lower case letter;
  • Has at least 1 special character;
  • Not allow space

I’m using the following expression:

(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[-_@#$%]).{8,}
javascript regex

1 answer

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Your expression looks good, but replace the =. for =.?*.
In addition, special characters are missing in the last group, and it is not in the question, but it is also limiting to a minimum of 8 characters (last group of the Expression).

It could be something like: 

$("input").keypress(function(){
    var input = $(this).val();
    var regex = new RegExp("^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[#?!@$%^&*-]).{8,}$");
    
    if(regex.test(input)) {
        $("#mensagem").hide();
    }else {
        $("#mensagem").show();
    }
});
label {
  color: red
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" />
<label id="mensagem">Inválido</label>

  • The only problem is that you keep accepting space

  • @Andrémachadodevargas Accepts space because in the end it has .{8,} and the point corresponds to any character (including spaces). If you want to limit what you can have, you have to be more specific, for example: ^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[-_@#$%])[-\w@#$%]{8,}$. I traded the point for [-\w@#$%] (the \w is a shortcut to letters, numbers and _), so you can only have the characters that are between the keys. See here the regex working.

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