js/ts - regular expression

Of course! Here is an example of how to use regular expressions (regex) in TypeScript:

Example: Validate an email address

// Função para validar e-mail usando regex
function validarEmail(email: string): boolean {
    const regex = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/;
    return regex.test(email);
}

// Testando a função
const email1 = "teste@example.com";
const email2 = "invalid-email@.com";

console.log(`${email1} é válido? ${validarEmail(email1)}`); // Saída: teste@example.com é válido? true
console.log(`${email2} é válido? ${validarEmail(email2)}`); // Saída: invalid-email@.com é válido? false

Regex Description:

• ^: Start of string.
• [a-zA-Z0-9._%+-]+: One or more alphanumeric characters, including periods, underscores, percentages, plus and minus signs.
• @: An "@" character.
• [a-zA-Z0-9.-]+: One or more alphanumeric characters or periods and hyphens.
• .: A literal period character.
• [a-zA-Z]{2,}: Two or more letters (for the top-level domain such as .com, .org, etc.).
• $: End of string.

This example shows how you can use regex to validate an email format in TypeScript. If you need more examples or explanations, feel free to ask!

by ChatGPT

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