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To extract information from text, you use a match/capture group with parentheses.
Regex: ^(.*).(img|png)$
This searches for line with one or more characters followed by a dot and image file extensions. If there is a match, the capture groups () will capture the file names and file extensions.
test1.img -- captures test1 and img
test2.img.bak
test3.png -- captures test3 and png
test4.txt