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Create a preg_match to verify the password allowing (! @ # $%)

I would like to create a preg_match function to check my passports, but I'm not sure how to write it to use the following special characters !@#$% .

 if(!preg_match(?????)$/', $password))

Here are my password rules that I want to use in regex:

  • May contain letters and numbers
  • Must contain at least 1 number and 1 letter
  • May contain any of these characters !@#$%
  • Must be 8-12 characters

Thank you for any help you can offer.

+8
php regex passwords preg-match
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8 answers

I think it should look like this:

 if(!preg_match('/^(?=.*\d)(?=.*[A-Za-z])[0-9A-Za-z!@#$%]{8,12}$/', $password)) { echo 'the password does not meet the requirements!'; }

Between the beginning → ^
And the end → $
strings must have at least one number → (?=.*\d)
and at least one letter → (?=.*[A-Za-z])
and it must be a number, a letter or one of the following :! @ # $% → [0-9A-Za-z!@#$%]
and should be 8-12 characters → {8,12}

As user557846 commented on your question, I would also suggest you allow more characters, I usually (if I use the maximum) take at least 50 :)

btw, you can take a look at this regex tutorial

+42
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 preg_match('/^(?=.*\d)(?=.*[@#\-_$%^&+=§!\?])(?=.*[az])(?=.*[AZ])[0-9A-Za-z@#\-_$%^&+=§!\?]{8,20}$/',$password)
  • at least one lowercase char
  • at least one uppercase char
  • at least one digit
  • at least one special character @ # -_ $% ^ & + = § !?
+6
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I liked the answer of r3bel, so I had a game with it, and as a password verification function, I got the following:

 function password_strength_check($password, $min_len = 8, $max_len = 70, $req_digit = 1, $req_lower = 1, $req_upper = 1, $req_symbol = 1) { // Build regex string depending on requirements for the password $regex = '/^'; if ($req_digit == 1) { $regex .= '(?=.*\d)'; } // Match at least 1 digit if ($req_lower == 1) { $regex .= '(?=.*[az])'; } // Match at least 1 lowercase letter if ($req_upper == 1) { $regex .= '(?=.*[AZ])'; } // Match at least 1 uppercase letter if ($req_symbol == 1) { $regex .= '(?=.*[^a-zA-Z\d])'; } // Match at least 1 character that is none of the above $regex .= '.{' . $min_len . ',' . $max_len . '}$/'; if(preg_match($regex, $password)) { return TRUE; } else { return FALSE; } }

The maximum / minimum length is by default or configurable, each requirement is enabled by default, but can be disabled, and I would like to support any characters, so the last requirement is "all that is not one of the above types", but a fixed character set.

+2
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I designed a full regex for more complex validation

 /^(?=.*\d)(?=.*[A-Za-z])(?=.*[AZ])(?=.*[az])(?=.*[ !#$%&'\(\) * +,-.\/[\\] ^ _`{|}~\"])[0-9A-Za-z !#$%&'\(\) * +,-.\/[\\] ^ _`{|}~\"]{8,50}$/

Basically, I check that the password has 1 digit, 1 capital, 1 lower and 1 special character. Hope this helps someone search for regex.

+1
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I did this with my special drupal form in hook_form_validate here the password should be 6 characters of letters, numbers and at least one special character.

 <? if (!preg_match('/^(?=.*\d)(?=.*[A-Za-z])(?=.*[!@#$%])[0-9A-Za-z!@#$%]{6,15}$/', $form_state['values']['pass'])) { form_set_error('pass', t('Password must contain 6 characters of letters, numbers and at least one special character.')); } ?>
0
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 if (!preg_match('/^(?=.*\d)(?=.*[A-Za-z])(?=.*[!@#$%])[0-9A-Za-z!@#$%] {6,15}$/',($_POST['password']))) { $message='Password must contain 6 characters of letters, numbers and at least one special character.'; }
0
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Search for character classes, the main function of regular expressions.

-one
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 if(!preg_match('/^(?=.*\d)(?=.*[A-Za-z])[0-9A-Za-z!@#$%]{8,12}$/', $password)) { echo 'the password does not meet the requirements!'; }

In the above statement .. what possible password exists?

-one
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