The /i has no impact with the character class ... but may very well have to do with the "j". If OP was concerned about the various combinations of .jpg, .JPG, Jepg, JPEG and so on, then the /i is, in fact, very much needed.
Updated to clarify the last sentence above
In reply to Re^2: RegEx Help
by ww
in thread RegEx Help
by Brian268
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