For example:

String: now is the time
Regex: /\stime/

Result: now is the time
Matched: Yes
[download]

might be uninformative to the newcomer who hasn't yet groked much about regexen (and, specifically, about the need to use capturing parens in your program to obtain appropriate feedback). OTOH, of course, it works splendidly for this (in which our presumed newcomer has come to understand captures, even if s/he can't follow your code):

String: now time
Regex: /now\s(time)/

Result: now time
Matched: Yes
Captures: [#1: 'time']
[download]

So, Good to go! for those who have at least some of the basics... but:

My bad! See alexm's correction, below.
String: fred same joe time
Regex: ?time?
The regex must be a valid match or a substitute expression.

String: |time|
Regex: |time|
The regex must be a valid match or a substitute expression.

String: fred same time
Regex: ~time~
The regex must be a valid match or a substitute expression.

String: fred same time
Regex: !time!
The regex must be a valid match or a substitute expression.

Perhaps a brief addition to the use_instruction (line 10) specifying the use of /.../ as the acceptable regex delimiter for input to this script (or re-coding to accept the usual alternatives?) and a bit of clarification about the output would make your script an even more valuable tool.