WeChall->Challenges->Challenge: Training: Regex

Why I can match the wechall3? Go to the Training: Regex challenge

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junfengwuhu

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Why I can match the wechall3?
May 15, 2017 - 06:01:49 (9y 170d) Google/translate0Thank You!0Good Post!0Bad Post! link

This is my re:

/^wechall4?\.tiff|gif|jpg|png|bmp$/

Why I can match the wechall3.png.
I think that I only match the wechall or wechall4?
Where is wrong?

Thanks a lot....

dloser

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RE: Why I can match the wechall3?
May 15, 2017 - 08:07:33 (9y 170d) Google/translate0Thank You!0Good Post!0Bad Post! link

Think about where the alternatives in your expressions begin and end (and how the matching algorithm would know this).

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