WebSome Perl books advise using parentheses when calling class methods, saying this helps to keep the parser from having to guess the intent of the code. However almost all Perl code I have seen (including modules on cpan) very rarely uses the parentheses when calling methods without arguments. Webone, and deservedly so. Many more recent regex engines are very similar, but not identical, to the one of Perl 5. Examples are the open source PCRE engine (used in many tools and languages like PHP), the .NET regular expression library, and the regular expression package included with version 1.4 and later of the Java JDK.

Perl calling methods with and without parentheses

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Perl Programming/Beginning exercises - Wikibooks, open books …

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