python regex. find specific word and number. match? -> write string in same line

Question

Hello im a beginner in python. ive got a txt file. this file contains

  hello
  hello 11.11.22

my code should be able to read the file and if there exist a string "hello" with a number after.( the number may contain variations.) the program should write after the number in the same line "TEST".

my code

 import re

with open('sonicwall.txt', 'r') as searchfile:
        for line in searchfile:
            if re.search('hello' and [00-100000], line, re.M|re.I):
                searchfile.append("TEST")

result should be in file:

hello
hello 11.11.22 TEST