Talk:Comparison of regular expression engines: Difference between revisions

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== python regex module missing ==

https://pypi.python.org/pypi/regex supports a broader set of features than pythons standard re module, especially recursive pattern matching --[[User:ThomasKalka|ThomasKalka]] ([[User talk:ThomasKalka|talk]]) 11:02, 28 March 2016 (UTC)

:Linked in the "Remarks" column for Python in the [[Comparison of regular expression engines#Languages|Languages table]]. [[User:Rootsmusic|rootsmusic]] ([[User talk:Rootsmusic|talk]]) 22:36, 14 December 2023 (UTC)

== Jan-2010 Update ==

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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. <!-- Template:Unsigned --><span class="autosigned" style="font-size:85%;">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:Bczhc|Bczhc]] ([[User talk:Bczhc#top|talk]] • [[Special:Contributions/Bczhc|contribs]]) 02:52, 5 February 2022 (UTC)</span> <!--Autosigned by SineBot-->

:and is there a need to add "variable-length lookahead" future property on regular expression features part 2? [[User:Bczhc|Bczhc]] ([[User talk:Bczhc|talk]]) 02:57, 5 February 2022 (UTC)

== possessive quantifiers ==

I'm missing the feature "possessive quantifiers" that some RegEx dialects have. I can only find the distinction between greedy and non-greedy, but technically there is greedy, lazy/reluctant and possessive.