Write an Apex method that takes an alphanumeric string as input and returns the sum of all the numbers present in the string. Non-numeric characters should be ignored.
Examples
Example 1
Input: 'a10b20c30'
Output: 60
Explanation: The numbers in the string are 10, 20, and 30. Their sum is 60.
Example 2
Input: '1a2b3c'
Output: 6
Explanation: The numbers in the string are 1, 2, and 3. Their sum is 6.
Example 3
Input: 'abc'
Output: 0
Explanation: There are no numbers in the string.
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