m/filename=(\d.*?)([a-zA-Z].*?)\.j/i)

I think that you probably want \d*? and [a-zA-Z]*?. Note the absence of the '.'.

Ie. You are applying the quantifier (*?) to the '.', not to the character class you want to match.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

In reply to Re: RegEx Help by BrowserUk
in thread RegEx Help by Brian268

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