Checking for any character using regular expressions in multiline text

Suppose you have the string

Start this is a 
multiline string End

and you want to match everything between the "Start" and "End" using a regular expression. The obvious one to use is

Start(.*)End

but in multi-line strings (strings that contain newlines) this will fail because "." does not match against newlines.

The answer? Use "[\s\S]" (match and space character or non-space character) instead of "."

Start([\s\S]*)End