正则表达式检查具有最小值和最大值的总位数

Question

I want to test a string of all alphanumeric characters and return true only if the total number of digits in the string is between 7 and 11.

1234567 // true

11qqw3qd1221wqd2132 // true

abc123def456ghi789klm012 // false

The min 7 and max 11 only applies to the digits within the string.

So I know how to test a string of digits for a min and max length:

^[\d]{7,11}$

But how do i do the same when :

A) the digits dont have to be consecutive and

B) there are other characters or white spaces in the string.

Answer 1

Try this

var str = "...";
var digits = str.length - str.replace(/[0-9]/g, '').length;
var ok = digits >=7 && digits <=11;

Or this

str.match(/^([^0-9]*[0-9]){7,11}[^0-9]*$/)