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epriestley fcb75d0503 Fix an issue where prose diffing may fail after hitting the PCRE backtracking limit 
Summary:
Fixes T13554. For certain prose diff inputs and PCRE backtracking limits, this regular expression may back track too often and fail.

A characteristic input is "x x x x ...", i.e. many sequences where `(.*?)\s*\z` looks like it may be able to match but actually can not.

I think writing an expression which has all the behavior we'd like without this backtracking issue isn't trivial (at least, I don't think I know how to do it offhand); just use a strategy based on "trim()" insetad, which avoids any PCRE complexities here.

Test Plan: Locally, this passes the "x x x ..." test which the previous code failed. I'm not including that test because it won't reproduce across values of "pcre.backtrac_limit", PCRE versions, etc.

Maniphest Tasks: T13554

Differential Revision: https://secure.phabricator.com/D21422
2020-07-23 07:46:15 -07:00
bin Remove the "ssh-auth-key" script 2019-10-28 17:52:37 -07:00
conf Remove an old digest in Celerity code and some obsolete configuration options 2019-01-04 13:43:38 -08:00
externals Remove PHPMailer code which generates bogus "Message-ID" email headers 2020-05-19 11:38:58 -07:00
resources In source views, wrap display tabs in "user-select: all" to improve cursor selection behavior 2020-07-17 15:10:06 -07:00
scripts Improve the quality of SSH error messages 2020-06-16 08:59:36 -07:00
src Fix an issue where prose diffing may fail after hitting the PCRE backtracking limit 2020-07-23 07:46:15 -07:00
support Use "@" to silence "GC list" warnings from "apc_store()" and "apcu_store()" 2020-04-28 04:13:37 -07:00
webroot In source views, wrap display tabs in "user-select: all" to improve cursor selection behavior 2020-07-17 15:10:06 -07:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Continue moving classes with no callers in libphutil or Arcanist to Phabricator 2020-02-12 13:14:04 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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