The regular expression tester can be found at <a href=https://regex101.com/>https://regex101.com/</a>.
<pre>

Good one letter words
A
I
O

Bad One Letter Words
Hey
Hi
Ho
4
6
<hr>

Good numbers
1
23
456
98765

Bad Numbers
1 2 3 
45t7
four
22/7
<hr>

Good Words That Start With A Capital Letter
My
Little
Pony

Bad words that don't start with a capital letter
frIendShip
is
magic



<hr>
Good Social Security Numbers
333-22-9814
123-45-6789
965-09-1524

Bad Social Security Numbers
12-345-6789
098-76-543
1x2-34-9876

<hr>
Good Tire Sizes
245/40 R15
205/55 R16
195/45 R14

Bad Tire Sizes
45/40 R15
205/55
195/4 R14
245/40 15
205/55 R6
195:45 R14





<hr>
Good Phone numbers:
906 225 1983
(312)555-1234
(312) 864-9810
226-8131
314-8532

Bad Phone Numbers
9x1 225 6429
(312) 551 131
(310 653-0913
(98) 762-0945
312-874
906 225 12345


<hr>
Good Date
1/2/03
9/13/2004
10/01/1993

Bad Date
13/1/03
11/004/1573
11/9 03

<hr>
Good People's Names
Steve Smith
Dale G. Everrt
W. H. Smith
Kale McCall
Kyle Dudness

Bad People's Names
Ste.ve Smith
dAle G. Evertt
W. H Smith
JoHn Johnson
Calison

<hr>
Good Email Addresses
apoe@nmu.edu
andy.poe@nmu.edu
andy1234@bbc.co.uk
AndyPoe@www.gmail.com

Bad email addresses
apoe.nmu.edu
andy@poe@nmu.edu
andy 1234 @bbc.co.uk
andyPoe@nmu

<hr>
Good Numbers with commas
1
234,567
8,765,432,100
12

Bad Numbers with Commas
12,34,56
1,2345
fourty-two
,345
789,



<hr>
Good URLs
http://euclid.nmu.edu
http://hockey.mtu.stinks.com/
https://www.cheese.com/ilovecheese.html
http://gmail.com/folder/inbox
http://fredfredburger.com/~bpeterso

Bad URLs
htt://turing.nmu.edu
http:///~apoe
http://steven@barney.com