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RE: $_

by jjhorner (Hermit)
on Jun 21, 2000 at 16:46 UTC ( [id://19215]=note: print w/replies, xml ) Need Help??


in reply to $_

When are people going to learn about the < code> notation?

As best as I can tell, here is what it says:

$dir='C:/texts/'; opendir(directory,$dir) or die "cant"; while($file=readdir directory){ next if $file=~/^\./; $rfname=$dir.$file; # print "Found file: '$rfname'\n"; open (CONT, $rfname); while (<CONT>){ if($_=~m/[0-3]?[0-9(th)?(st)?(nd)?(rd)?]\s+(Jan(uary)?|Feb(ruary)? +|Mar(ch)?|Apr(il)?|May|Jun(e)?|Jul(y)?|Aug(ust)?|Sep(tember)?|Oct(obe +r)?|Nov(ember)?|Dec(ember)?)\s+[0-9]?[0-9]?[0-9][0-9]/ig){ print "$file\t $_\n"; } elsif($_=~m/(Jan(uary)?|Feb(ruary)?|Mar(ch)?|Apr(il)?|May|Jun(e)?| +Jul(y)?|Aug(ust)?|Sep(tember)?|Oct(ober)?|Nov(ember)?|Dec(ember)?)\s+ +[1-3]?[0-9](th)?(nd)?(st)?(rd)?\s+[0-9]?[0-9]?[0-9][0-9]/ig){ print "$file\t $_\n"; } }

Looking at your code, and another response, I see your problem. You are telling it to print the entire string.

If you have _Learning Perl_, by our own merlyn, look at 7.3.2.3, "Parentheses as memory".

Also, from _Programming Perl_:

     A regular expression in parentheses, (...), matches whatever the regular expression (represented by ...) matches according to Rule 2. Parentheses
     therefore serve as a grouping operator for quantification. Parentheses also have the side effect of remembering the matched substring for later use in a
     backreference (to be discussed later). This side effect can be suppressed by using (?:...) instead, which has only the grouping semantics - it doesn't store
     anything in $1, $2, and so on.

Look into spending $60 for the Perl CD Bookshelf. It rocks.

J. J. Horner
Linux, Perl, Apache, Stronghold, Unix
jhorner@knoxlug.org http://www.knoxlug.org/

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