Could you please provide more information as to what you think should be added? If there's something that one will likely run into when using the ungreedy modifier, which would benefit others to know, it will certainly be added. :)

Something like:

Ungreedy matching is normally limited to strings of < 100k characters; this is configured by [link]pcre.backtrack_limit[/link] 

A similar warning should also go in the section on regexp repetition here:
http://uk3.php.net/manual/en/regexp.reference.repetition.php


I think it's worth putting this warning in both places, because perl-hackers will tend to use REs like ".*?", whereas people arriving from other languages are more likely to discover greed/laziness by reading about the pattern-modifiers. Also, if one does exceed this limit, PHP doesn't complain about it: not even an E_NOTICE!

Incidentally, I have no performance problem with raising this value from 100k to 100M, and I can still match a 90M character string in under 3 seconds on a netbook.

This bug has been fixed in the documentation's XML sources. Since the
online and downloadable versions of the documentation need some time
to get updated, we would like to ask you to be a bit patient.

Thank you for the report, and for helping us make our documentation better.