Python Regex to extract maximum numeric value from a string
Given an alphanumeric string, extract maximum numeric value from that string. Alphabets will only be in lower case.
Examples:
Input : 100klh564abc365bg Output : 564 Maximum numeric value among 100, 564 and 365 is 564. Input : abchsd0sdhs Output : 0
This problem has existing solution please refer Extract maximum numeric value from a given string | Set 1 (General approach) link. We will solve this problem quickly in python using Regex. Approach is very simple,
- Find list of all integer numbers in string separated by lower case characters using re.findall(expression,string) method.
- Convert each number in form of string into decimal number and then find max of it.
# Function to extract maximum numeric value from # a given stringimport re def extractMax(input): # get a list of all numbers separated by # lower case characters # \d+ is a regular expression which means # one or more digit # output will be like ['100','564','365'] numbers = re.findall('\d+',input) # now we need to convert each number into integer # int(string) converts string into integer # we will map int() function onto all elements # of numbers list numbers = map(int,numbers) print max(numbers) # Driver programif __name__ == "__main__": input = '100klh564abc365bg' extractMax(input) |
Output:
564
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