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- 4111 1111 1111 1111
- 4111111111111111
- var regex = /^(?:4[0-9]{3}(?:s[0-9]{4}){0,15}?|5[1-5][0-9]{14}|3[47][0-9]{13}|6(?:011|5[0-9][0-9])[0-9]{12})$/;
- console.log(regex.test(input.value));
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