PHP to Javascript compare string with characters list

Question

I have this PHP function to compare a username $value with a characters list:

strlen($value) == count(array_intersect(array_map("strtoupper", str_split($value)), str_split("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-")))

I need to obtain something similar using Jquery. I have problems with array_intersect() at the moment, I can't find any similar function.
Thanks for any answer.

Can you please elaborate on what the right side of the expression does? (Or what you are trying to compare in general?) — rink.attendant.6
– rink.attendant.6, Commented Jun 1, 2014 at 10:12
@rink.attendant.6 It explodes $value into an array, then intersects it with the caracters list and count the occurrencies (they must be same as $value length — Xriuk
– Xriuk, Commented Jun 1, 2014 at 10:20

Community · Accepted Answer · 2017-05-23 12:11:03Z

2

Stack Overflow has already questions about array intersection in JavaScript.

You may also be interested by intersection function in Underscore.js.

Finally, wouldn't it be easier here to use regular expressions? In PHP, your code becomes as simple as:

$isValidUserName = preg_match('/^[A-Z_\-]+$/i', $value);

In JavaScript:

var isValidUserName = (/^[A-Z_\-]*$/i).test('Hello_World');

edited May 23, 2017 at 12:11

CommunityBot

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answered Jun 1, 2014 at 10:12

Arseni Mourzenko

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1 Comment

Xriuk Over a year ago

Thanks, it's much more efficient!

martynas · Accepted Answer · 2014-06-01 10:13:58Z

0

Use Underscore.js and try:

_.intersection(A, B);

Look into _.intersection()

answered Jun 1, 2014 at 10:13

martynas

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