Mark Rummel Mark Rummel - 1 year ago 121
PHP Question

Create preg_match for password validation allowing (!@#$%)

I would like to create a

function to validate my passowrds, but I'm not sure how to write it to allow the following special characters to be used:

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

Here are my password rules that I want to work into the regex:

  • May contain letter 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.

Answer Source

i think this should look like that:

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

Between Start -> ^
And End -> $
of the string there has to be at least one number -> (?=.*\d)
and at least one letter -> (?=.*[A-Za-z])
and it has to be a number, a letter or one of the following: !@#$% -> [0-9A-Za-z!@#$%]
and there have to be 8-12 characters -> {8,12}

as Mark Rummel commented to your question, I would also suggest you to allow more characters, I usually (if i use a maximum) take at least 50 :)

btw, you might want to take a look at this regex tutorial

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