how to match the back slash in the regular expression

Question

I want my user password have the rule like:

at least one alphabet, at least one number.
can include special characters (almost all special characters in keybord)
length more than 8.

this is my regular expression

/^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d!"#$%&'()*+,-.\/:;<=>?@[\]^_`{|}~]{8,}$/

but it does not match the back slash . for example ,the password "3e5t1qa2w\" will fail.

I use laravel(php framework) validation ,so the full code is this:

        'password' => array(
            'sometimes',
            'required',
            'between:8,32',
            'regex:/^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d!"#$%&\'()*+,-.\/:;<=>?@[\]^_`{|}~]{8,}$/'
        ),

here is the real code

and this one which use two back slash doesnot work too.

Does someone knows why?

I believe you need to escape the backslash with another backslash. — MateoConLechuga, Dec 22 '16 at 02:42
yes I do, like ......[back slash back slash]........ but didnot work — chii, Dec 22 '16 at 02:43
you really need to read this: http://stackoverflow.com/questions/401656/secure-hash-and-salt-for-php-passwords — , Dec 22 '16 at 02:44
@MateoConLechuga yes I did it. I have added a image in my question. it does not work ,cannot match "1qa2w/" — chii, Dec 22 '16 at 02:49
Edited my comment above; the ] causes it to close too early for the single chars you wanted to match — MateoConLechuga, Dec 22 '16 at 02:51
You want a length more than eight but the example password you've provided is only six characters, for starters. — robere2, Dec 22 '16 at 02:53
@bugfroggy I'm sorry it's just a mistake."1qa2ws3e/"does not match too. — chii, Dec 22 '16 at 02:56

Ivan Loler · Answer 1 · 2018-11-15T14:06:21.483

2

Your solution didn't work for me in Laravel 5.4., but using 4 backslashes did (at the near end). I'll leave it here if someone has the same problem:

/^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d!"#$%&'()*+,-.\/:;<=>?@[\]^_`{|}~\\\\]{8,}$/

DEMO

edited Nov 15 '18 at 14:06

answered Nov 15 '18 at 13:38

Ivan Loler

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score 0 · Answer 2 · edited May 23 '17 at 12:13

0

this one worked:

As MateoConLechuga said, the "]" may cause the problem. so I escape the "[" and "]" with back slash which meas they are just the "character".

and this link Right way to escape backslash [ \ ] in PHP regex? helped me that to match back slash i have to write it for three(or four) times.

edited May 23 '17 at 12:13

Community

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answered Dec 22 '16 at 03:38

chii

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how to match the back slash in the regular expression

2 Answers2