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Match Valid Username in Javascript

Javascript

Regulärer Ausdruck

^[a-zA-Z0-9_]{5,20}$
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Erklärung

This regex pattern matches a valid username that consists of alphanumeric characters (both uppercase and lowercase), underscores, with a length between 5 and 20 characters.

Javascript

Beispielverwendung

const regex = /^[a-zA-Z0-9_]{5,20}$/; 
const username = 'john_doe123'; 
if (regex.test(username)) { 
    console.log('Valid username'); 
} else { 
    console.log('Invalid username'); 
}
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