From b82f549a3382aa710394a4b7c2f1aa7bfd7e673a Mon Sep 17 00:00:00 2001
From: Vaxry <vaxry@vaxry.net>
Date: Sat, 21 Dec 2024 23:13:09 +0000
Subject: [PATCH] windowrules: mention regex caveats

---
 pages/Configuring/Window-Rules.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pages/Configuring/Window-Rules.md b/pages/Configuring/Window-Rules.md
index 16aefba..ad5b943 100644
--- a/pages/Configuring/Window-Rules.md
+++ b/pages/Configuring/Window-Rules.md
@@ -99,6 +99,13 @@ size, you can use `hyprctl clients`.
 
 {{< /callout >}}
 
+### RegEx writing
+
+Please note Hyprland uses Google's RE2 for parsing Regex. This means that all operations requiring polynomial
+time to compute will not work. See [the re2 wiki](https://github.com/google/re2/wiki/Syntax) for supported extensions.
+
+If you want to _negate_ a regex, as in pass only when the regex _fails_, you can prefix it with `negative:`, e.g.: `negative:kitty`.
+
 ## Rules
 
 ### Static rules