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:A bit of digging provided: PCRE was created 1997, when Perl 5.004 was out. PCRE 2.0 was created in 1998, when Perl 5.005 (with regex updates) was released. PCRE 7.0-7.3 were done in 2006-2007 in co-development for Perl 5.10 (with more groundbreaking regex updates). Sebastian --[[Special:Contributions/88.217.185.170|88.217.185.170]] ([[User talk:88.217.185.170|talk]]) 22:20, 12 October 2019 (UTC)
== About Java Regex Variable-length lookaround ==
I just tested regex "(?<=[a-z]+)[0-9]+" on some Java platforms, including Oracle JDK and OpenJDK 1.8, Oracle JDK and OpenJDK 17 at the text "abcd12345", and it gave the correct result "12345"; the variable-width look-ahead regex "[0-9]+(?=[a-z]+)" also works fine on Java on my machine. But on Android platform with API level 29 and Java source/target compatibility version 1.8, this regular expression has a compilation error for the reason of "non-fixed width look-behind". Also on the website [https://regex101.com/r/kB8Y47/1 regex test] it fails with Java 8 flavor.
I don't know how these work on Java, and the different results above, very confused now.
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