Extract maximum numeric value from a given string | Set 2 (Regex approach)
Given an alphanumeric string, extract maximum numeric value from that string.
Input : 100klh564abc365bg Output : 564 Maximum numeric value among 100, 564 and 365 is 564. Input : abchsd0365sdhs Output : 365
Below is one of the regular expression for at least one numeric digit.
So Regex solution is simple:
- Initialize MAX = 0
- Run loop over matcher, whenever match found, convert numeric string to integer and compare it with MAX.
- If number greater than MAX, update MAX to number.
- Return MAX at the last.
But above program wouldn’t work if number is greater that integer range. You can try parseLong() method for numbers upto long range.But to handle the case of large numbers(greater than long range) we can take help of BigInteger class in java. Below is the java program to demonstrate the same.
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