Write a Python program to search the numbers (0-9) of length between 1 to 3 in a given string

Sure, here is a Python program that uses regular expressions to find numbers of length 1 to 3 in a given string:

import re

def find_numbers_in_string(string):
    pattern = r'\b\d{1,3}\b'
    result = re.findall(pattern, string)
    return result

# Test the function
string = "123 abc456 7890 abc 12"
print(find_numbers_in_string(string))

In this program, we first import the re module, which allows us to use regular expressions. We then define a function find_numbers_in_string that takes a string as input.

Inside the function, we define a pattern to search for. The pattern \b\d{1,3}\b means "find sequences of digits (\d) of length 1 to 3 ({1,3}) that are whole words (\b on both sides)".

We then use re.findall to find all matches of the pattern in the string. The function returns a list of all matches.

Finally, we test the function with a string that contains numbers of various lengths. The function should return a list of the numbers of length 1 to 3.