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Level 3  Go to the Training: Regex challenge

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my regex:
/^wechall4?(?=\.(jpg|png|bmp|gif|tiff))$/

so I tried this and apparently, it would not match "wechall.jpg"
But I can't see my mistake after browsing through this forum.
Can u please help me?

greets
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The construct you use is checked, but isn't included in the actual match. So the "pointer" (if you will), is still at '.' after it. The next check is to see if it is at the end of the string, which will fail.

Read the documentation very carefully. ;)
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