By David Harlan

With a overview by way of Tom Christiansen, one of many unique Perl founders, this can be probably the most complete books out there, masking Perl OOP constitution, socket programming, HTML conversions, development net seek utilities, and extra! * Focuses seriously at the home windows NT model of Perl * presents assurance of complicated Perl issues, together with object-oriented programming with Perl * CD-ROM contains the whole digital model of the publication in HTML layout, in addition to different Que books

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These matched quantities are called backreferences and are explained in the following section. ● Two-or three-digit octal number: the character with that number as character code, unless it's possible to interpret it as a backreference. ● x, followed by two hexadecimal digits: the character with that number as its character code. \x3e, for example, is >. ● c, followed by a single character: the control character. \cG, for example, matches Ctrl+G. ● Any other character: the character itself. \&, for example, matches the & character.

Any other character: the character itself. \&, for example, matches the & character. Matching Now you're ready to start putting all that information together with some real pattern matching. The match operator normally consists of two forward slashes with a regular expression in between, and it normally operates on the contents of the $_ variable. *y$/ are all true. Matching on $_ The $_ operator is special; see Chapter 13, "Special Variables," for full details. In many ways, $_ is the default container for data that is being read in by Perl.

Bb" is "aabb") # so the variable "$inits" takes on the value of the initials of the name: $inits = substr( $forename, 0, 1 ) . substr( $surname, 0, 1 ); # Now we store the name in an associative array using the initials as the key: $NamesByInitials{$inits} = $name; } # Having built the associative array, we simply refer to it at the end of the # subroutine so that it's value is the last thing evaluated here. It will then # be passed back to the calling function. htm (25 of 31) [2/17/2007 1:23:00 PM] Chapter 1 -- Perl Overview %NamesByInitials; } Variable Scope Perl uses separate name spaces to store scalars, arrays, associative arrays, and so on.

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