From 2c9e22ef889b1b88df7b956d705a1069c10d5e68 Mon Sep 17 00:00:00 2001
From: XhmikosR <xhmikosr@gmail.com>
Date: Sun, 1 Sep 2019 13:23:58 +0300
Subject: [PATCH] getting-started/theming.md: throw an error if the regex
 doesn't succeed.

---
 site/content/docs/4.3/getting-started/theming.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/site/content/docs/4.3/getting-started/theming.md b/site/content/docs/4.3/getting-started/theming.md
index 9c34c9ee3f..1703770e70 100644
--- a/site/content/docs/4.3/getting-started/theming.md
+++ b/site/content/docs/4.3/getting-started/theming.md
@@ -373,6 +373,10 @@ Here are the variables we include (note that the `:root` is required). They're l
 {{- $css := readFile "dist/css/bootstrap.css" -}}
 {{- $match := findRE ":root {([^}]*)}" $css 1 -}}
 
+{{- if (eq (len $match) 0) -}}
+{{- errorf "Got no matches for :root in %q!" $.Page.Path -}}
+{{- end -}}
+
 {{- index $match 0 -}}
 
 {{< /root.inline >}}