How to check if value contains at least one character, expect for space

Question

I`m building messaging app and I need regex or some other way to validate message that user is about to send. Message must contain at least one character, expect for space.

const valid = *regex*

const message_a = "Hello, Jim!";
const message_b = " ";
const message_c = "      ";

valid.test(message_a) === **true**
valid.test(message_b) === **false**
valid.test(message_c) === **false**

I don't know how to make regex, so I just searched for such regex and found none. So I'm really looking forward for your answers, thanks!

How about `message.trim().length > 0`? – Phil Jul 31 '23 at 06:54 — Phil, Jul 31 '23 at 06:54

score 1 · Accepted Answer · answered Jul 31 '23 at 06:56

1

If you want to go the regex route, simply match on \S:

var input = "Hello, Jim!";
if (/\S/.test(input)) {
    console.log("MATCH");
}

The pattern /\S/ will match any single non whitespace character, anywhere in the input.

answered Jul 31 '23 at 06:56

Tim Biegeleisen

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Question seems to specifically ask for excluding spaces, not any white-space character – mousetail Jul 31 '23 at 06:57
1

Then we can use `[^ ]`, but I would expect that tab should also be included. – Tim Biegeleisen Jul 31 '23 at 06:58

How to check if value contains at least one character, expect for space

1 Answers1