index.html file
<!DOCTYPE html>
<html lang="en">
<body>
<script>
let re;
re=/hello/i; //case insensitive
re=/^hello/; //must start with hello
re=/hello$/; //must end with hello
re=/h.llo/; //any char only once
re=/h*llo/; //any char more than one time
re=/[ha]llo/; //only h or a allowed(only 1)
re=/[^ha]llo/; //any char except h or a allowed(only 1)
re=/[A-Za-z]llo/; //any alphabet allowed(only 1)
re=/[0-9]llo/; //any digit allowed(only 1)
re=/hel[a-z]{2}o/; //any small letter, exactly 2 times
re=/hel[a-z]{1,3}o/;//any small letter,1-3 times.
const res=re.exec('allhello all');
console.log(res);
</script>
</body>
</html>
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