js regex match first 3 characters in string

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const expression = /^.{3}/; 


// Usage example:

const text = '123Example';
const result = text.match(expression);

if (result) {
    console.log(result);  // ['123']
}

// ^ matches the beginning of the string
// . matches any character except line breaks
// {3} matches 3 of preceding token (matches 3 .)