Javascript regexp character matching

Question

I'm looking into using a jQuery password strength indicator and have found one that looks suitable.

It increases the password strength score if special characters are detected:

if (password.match(/(.*[!,@,#,$,%,^,&,*,?,_,~].*[!,@,#,$,%,^,&,*,?,_,~])/)){ score += 5 ;}

However I'd like to be able to specify additional special characters and because these lists of special characters are used in several places, I'd like to only specify the list once:

list = array(!,@,#,$,%,^,&,*,?,_,~,[,],{,},(,));
if (password.match(/(.*[list].*[list])/)){ score += 5 ;}

Is this possible?

Don't see any usage of jQuery here. Of course you can define list somewhere in global. Use list.join("") to get serialized chars list. — Tommi
– Tommi, Commented Jul 11, 2013 at 9:01

RichieHindle · Accepted Answer · 2013-07-11 09:10:09Z

3

You can use strings:

var special = "!@#$%^&*?_~[]{}()".split('').join('\\');
if (password.match(new RegExp("(.*[" + special + "].*[" + special + "])")))...

(The join-with-backslashes escapes the special characters so they are treated literally by the regex engine.)

edited Jul 11, 2013 at 9:10

answered Jul 11, 2013 at 9:01

RichieHindle

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Comments

Eric · Accepted Answer · 2013-07-11 09:02:22Z

2

Yes, if you use the RegExp() constructor, you can pass in a string as regexp.

var list = ['\\!', '\\@', '\\#', '\\%'];
var reg = new RegExp('(.*['+ list.join(',') + '].*['+ list.join(',') +'])');
if (reg.test("MySuperPassword!#_123")) {
    score += 5;
}

answered Jul 11, 2013 at 9:02

Eric

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Comments

mishik · Accepted Answer · 2013-07-11 09:12:44Z

0

You do not need to separate chars by , in regex:

var list = "[\\!@#\\$%\\^&\\*\\?_~]";
var your_regex = new RegExp(".*" + list + ".*" + list);
if (your_regex.test(password)){
  score += 5;
}

edited Jul 11, 2013 at 9:12

answered Jul 11, 2013 at 9:00

mishik

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3 Comments

Tim Over a year ago

you should also escape meaningful symbols, such as ? ... e.g. /[\?\!]/

Tim Over a year ago

you also can't embed variables in strings like "list" in JS, they need to be concatenated. Sorry, I guess I'm that guy

georg Over a year ago

@Tim: there's no need to escape ? or ! here.

adeneo · Accepted Answer · 2013-07-11 09:13:17Z

0

Why would you need a regex?

var list  = ['!','@','#','$','%','^','&','*','?','_','~','[',']','{','}','(',')'],
    score = 0;

for (var i=list.length;i--;) {
    if ( password.indexOf(list[i]) ) score++;
}

FIDDLE

edited Jul 11, 2013 at 9:13

answered Jul 11, 2013 at 9:06

adeneo

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