Warning of superfluous escape character when executing 'npm start' on a React application

Question

Warning of superfluous escape character when executing 'npm start' on a React application

I have encountered a warning while running my React app using npm start. The warning appears in the terminal and reads as follows:

Line 24: Unnecessary escape character: \[no-useless-escape

The warning is related to the following code snippet:

validateEmail(email) {
    const re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return re.test(email);
}

I am seeking guidance on how to resolve this warning. What steps should I take?

javascript node.js reactjs npm ecmascript-6

Answer 1

Answer №1

Make sure to include an additional forward slash / in your code snippet:

function checkEmailValidity(email) {
    const pattern = /^(([^<>()\\[\]\\.,;:\s@"]+(\.[^<>()\\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return pattern.test(email);
}

Answer 2

Make sure to include an additional forward slash / in your code snippet:

function checkEmailValidity(email) {
    const pattern = /^(([^<>()\\[\]\\.,;:\s@"]+(\.[^<>()\\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return pattern.test(email);
}

Warning of superfluous escape character when executing 'npm start' on a React application

Answer №1

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