Modern Perl: 2014 Edition by chromatic

Author:chromatic
Language: eng
Format: azw3
ISBN: 9780985451943
Publisher: Onyx Neon Press
Published: 2011-12-06T16:00:00+00:00

Interpolation Happens

Without those curly braces, Perl's parser would interpret the variable name as $ascii_vowelst, which either causes a compile-time error about an unknown variable or interpolates the contents of an existing $ascii_vowelst into the regex.

The hyphen character (-) allows you to include a contiguous range of characters in a class, such as this $ascii_letters_only regex:

my $ascii_letters_only = qr/[a-zA-Z]/;

To include the hyphen as a member of the class, use it at the start or end of the class:

my $interesting_punctuation = qr/[-!?]/;

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