Find all floats or ints in a given string

Question

Given a string, "Hello4.2this.is random 24 text42", I want to return all ints or floats, [4.2, 24, 42]. All the other questions have solutions that return just 24. I want to return a float even if non-digit characters are next to the number. Since I am new to Python, I am trying to avoid regex or other complicated imports. I have no idea how to start. Please help. Here are some research attempts: Python: Extract numbers from a string, this didn't work since it doesn't recognize 4.2 and 42. There are other questions like the one mentioned, none of which sadly recognize 4.2 and 42.

Answer 1

A regex from perldoc perlretut:

import re
re_float = re.compile("""(?x)
   ^
      [+-]?\ *      # first, match an optional sign *and space*
      (             # then match integers or f.p. mantissas:
          \d+       # start out with a ...
          (
              \.\d* # mantissa of the form a.b or a.
          )?        # ? takes care of integers of the form a
         |\.\d+     # mantissa of the form .b
      )
      ([eE][+-]?\d+)?  # finally, optionally match an exponent
   $""")
m = re_float.match("4.5")
print m.group(0)
# -> 4.5

To get all numbers from a string:

str = "4.5 foo 123 abc .123"
print re.findall(r"[+-]? *(?:\d+(?:\.\d*)?|\.\d+)(?:[eE][+-]?\d+)?", str)
# -> ['4.5', ' 123', ' .123']