From: bob ackerman <[EMAIL PROTECTED]>
> i don't understand your answer. how will that match anything?
> the first line matches the whole block ok, but then the match is
> dropped by the '!' phrases since they are in the text. also, where is
> documented the ellipsis in a grep? also, using two regexes on either
> side of the ellipsis?
I am not using two regexps on one site of the ellipsis.
If I add braces into the code you'll get this:
grep { ( /START_KEYWORD/.../END_KEYWORD/ )
and ( !/START_KEYWORD/ )
and ( !/END_KEYWORD/} )
Let's "interpret" the code in mind.
We have
@data = ( "some header",
"some more unimportant stuff",
"START_KEYWORD",
"here's the text we want",
"and here some more",
"END_KEYWORD",
"and again some boring stuff"
);
@filtered = grep { ( /START_KEYWORD/.../END_KEYWORD/ )
and ( !/START_KEYWORD/ )
and ( !/END_KEYWORD/ ) } @data;
So first Perl processes the first item ("some header") : the elipsis
returns false, the other conditions are not even tried, item is not
accepted.
Second item ("some more unimportant stuff") : again the same,
ellipsis is false => item is not accepted.
Third item ("START_KEYWORD") : ellipsis matches, returns true
and switches to the second state (that is it'll return true until it
matches the END_KEYWORD), but the second condition returns
false so the item is not accepted.
Fourth item ("here's the text we want") : the item doesn't match the
"ending condition" of the elipsis so the ellipsis still returns true, the
other two conditions also return true (keep in mind that the regexps
are negated!) => item is accepted.
Fifth item : same as fourth
Sixth item ("END_KEYWORD") : the "end condition" of the ellipsis
matches, ellipis returns true but switches to the first (false) state,
the second condition returns true, but the third condition returns
false => item is not accepted.
....
Jenda
=========== [EMAIL PROTECTED] == http://Jenda.Krynicky.cz ==========
There is a reason for living. There must be. I've seen it somewhere.
It's just that in the mess on my table ... and in my brain
I can't find it.
--- me
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