Read in a string and output its longest string of digits

Read in a string str and output the longest continuous number string in the string str

a str with a length of no more than 255

Example:

   enter:

    abc123defg123456789hjfs123456

   output:

      123456789

The procedure is as follows:

#include <stdio.h>
#include <string.h>
intmain()
{
    int i,k,key,sum,max,len[300];
    char a[300];
    scanf("%s",a);
    for(int j=0;j<300;j++)  
    {    
        len [j] = 0;
    }
    for(i=0;i<strlen(a);i++)
    {
        k=i;
        sum=0;
        while(a[i]>='0' && a[i]<='9')
	{
            i++;
            sum++;
        }
        len[k]=sum; //Save the length of the array string that appears in each position in len[], and 0 if it does not appear
    }
    max=0;
    for(i=0;i<strlen(a);i++)
    {
        if(max<len[i])
	{
            max = len[i]; //Save the length of the longest number string
            key = i; //Record the longest number string, the initial address
        }
    }
    for(i=0;i<max;i++) //output from the key subscript, max numbers
    {
        printf("%c",a[key++]);
    }
    printf("\0");
    printf("\n");
    return 0;
}

Screenshot of the program running:

Because python has built-in functions and libraries, it is very convenient to call

Let's take a look at the code to solve this problem in python:

import re
input_val = input()
split_char = re.split(r'\D*', input_val)
print(max(split_char, key=len))