How to check if a string contains any character from another string?

Question

How can I determine if any individual character in src matches any individual character in restricted? I have this JS method which does the job, but I'd like to improve it if I can:

function CheckRestricted(src, restricted) { for (var i = 0; i < src.length; i++) { for (var j = 0; j < restricted.length; j++) { if (src.charAt(i) == restricted.charAt(j)) return false; } } return true; }

If this were C#, I could achieve this with LINQ in a single line:

bool CheckRestricted(string src, string restricted) { return src.Any(s => restricted.Contains(s)); }

Is there some sort of similar functionality in JS that I'm unaware of?

EDIT: Sample use case:

CheckRestricted("ABCD", "!+-=;:'`"); //true CheckRestricted("ABCD!", "!+-=;:'`"); //false

It is predominantly used to disallow 'special characters'.

Possible duplicate of Javascript. Checking if string contains text from an array of substrings — Heretic Monkey
– Heretic Monkey, Commented Apr 11, 2017 at 16:12

juvian · Accepted Answer · 2017-04-11 16:16:20Z

5

function CheckRestricted(src, restricted) { return !src.split("").some(ch => restricted.indexOf(ch) !== -1); }

edited Apr 11, 2017 at 16:16

answered Apr 11, 2017 at 16:06

juvian

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7 Comments

Andreas Over a year ago

The second .split("") is not necessary

MultiplyByZer0 Over a year ago

You can use String.prototype.includes()

sab669 Over a year ago

This seems to work for me, at least it does using a web-based JS compiler. For some reason Visual Studio 2013 gives a syntax error on =>? But what does VS know about JS, anyways :)

juvian Over a year ago

@Andreas thx, looks nicer that way and more efficient. And yeah missunderstood when it should return true, changed

juvian Over a year ago

@sab669 => sintax is ecmascript 6, you could always do the old function (ch) {return estricted.indexOf(ch) !== -1}

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