JAVASCRIPT

regex for number and letters

let regex = /[^A-Za-z0-9]+/

regex 10 numbers only

@"^d{10}$"

regex numbers or letters

[A-Z0-9]*

regex only string and numbers

export const onlyNumbersAndLetters = (value) => {
    if(value) 
        return value.replace(/[^a-zA-Z0-9]/g, '');
}

regex only digits

console.log(`12331: ${/^d+$/.test('12331')}`) // true 
console.log(`abc: ${/^d+$/.test('abc')}`) // false