Perl Compatible Regular Expressions (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Perl Compatible Regular Expressions" in English language version.

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PCRE2 - Perl-compatible regular expressions (revised API) (2020), by University of Cambridge: https://pcre.org/pcre2.txt
Differences Between PCRE2 and Perl (2019-07-13), by Philip Hazel: https://www.pcre.org/current/doc/html/pcre2compat.html
Quote PCRE changelog (https://www.pcre.org/original/changelog.txt): "Perl no longer allows group names to start with digits, so I have made this change also in PCRE."
ChangeLog for PCRE2: https://www.pcre.org/changelog.txt