Neat and powerful.

One quibble-- if you had a non-word character in there, like so: 

foo=hello
fruit=apple
foo.bar=tunafish
color=red
baz=$foo.bar

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Then it would turn it into 
baz=hello.bar

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instead of 
baz=tunafish

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Still, it's a powerful technique, and I like it. It gives config-files a Makelike capability. You could say: 

SCRIPT_DIR=/usr/local/scripts
MAIN_SCRIPT=$SCRIPT_DIR/main_script.pl

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and then get: 
MAIN_SCRIPT=/usr/local/bin/scripts/main_script.pl

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You could probably answer the above objection by putting bracket support into it, like so (untested): 

$value =~ s/\$ ( {\.+?} | \w+)/$config{$2}/gx;

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That way, we could handle my previous example like so: 
foo=hello
fruit=apple
foo.bar=tunafish
color=red
baz=${foo.bar}

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In reply to RE: RE: Config file parser by stephen
in thread Config file parser by ishamael

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