Line comment bug

[Adrian-Hawryluk]

So I was making a big ass regex for use in AHK and it wasn't working. Seems that the line comment (# ...) has a bug. Using the x mode with LFs as a EOL marker, this regex worked:

	a
	# comment before error
	(

When obviously it should have had a parse error. Changing the EOL line marker to CRLF did seem to resolve the issue as did converting the line comment to an embedded ((?# ...)) comment.

According to the ahk change log, it's using version 8.30 (search for text PCRE).

[PhilipHazel]

I don't know what AHK is, but if it's using 8.30 it is relying on an unmaintained, obsolete PCRE1 release that was released in 2012. The final PCRE1 release is 8.45 (2021) - there is no more maintenance. PCRE development is now entirely on PCRE2, so we need evidence of something not working in PCRE2 (current release 10.40), preferably as a regex/subject pair that doesn't do what you expect, before any investigation of a possible bug will happen. (Even more preferably as a pcre2test input file.)

[Adrian-Hawryluk]

Never mind. It was explained to me that the switch to set what pcre uses to match a newline actually also affects the regex itself. It is apparently not so much of a bug but a feature. 🙄