When I run my snippet as posted, I get the following output: 
extracted foo, bar, baz; left ...blah......blah...

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Do you get something different when you run it? Or do you want something different from that?

When you try to use the "s{...}{}" expression in your own code, is it possible that your "raw binary data" (in "the baz part") might contain a byte value of 0x3C? This would be treated as a "<" character in the regex match, which would cause trouble. Something like this might work better in that case: 

s{<file fiop="([^"]+)" length="([^"]+)"/>(.*?)</file>}{}s

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(update: added the "s" modifier at the end, in case the raw binary stuff might contain a line-feed)

Note the question mark after ".*" -- that's the important thing that was missing from your initial attempt: it makes the wildcard match non-greedy (stops matching as soon as possible).

In reply to Re^3: extracting a substring from a string - multiple variables by graff
in thread extracting a substring from a string - multiple variables by walinsky

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