Groups3:08 with Joel Kraft
Grouping characters allows you to apply modifications to multiple characters the way you have learned to do with single characters.
Copy both the Match and the Exclude set of test strings from each exercise below into a Regex tester like regexpal or regex101. Using what you've learned so far, create a regular expression that will match all of the strings in the Match set and exclude the ones in the Exclude set.
img_01.jpg img_02.png img_03.gif img_04.png img_05.gif img_06.jpg
projector protractor proctor
img_sm_01.jpg img_01.jpg img_sm_02.jpg img_02.jpg img_sm_03.jpg img_03.jpg img_sm_04.png img_04.png
www.github.com github.com www.teamtreehouse.com teamtreehouse.com api.github.com
You need to sign up for Treehouse in order to download course files.Sign up