From ec85b9352febb982dd02469635d0553901acce4d Mon Sep 17 00:00:00 2001
From: Alexey Rusakov <Kitsune-Ral@users.sf.net>
Date: Sun, 3 Oct 2021 19:43:03 +0200
Subject: prettyPrint(): tighten up Matrix identifier regex

It was too permissive on characters before the identifier and also
allowed the domain name to start on dash, which should not occur.
Closes #512.
---
 lib/util.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/util.cpp b/lib/util.cpp
index 875d7522..5de8638e 100644
--- a/lib/util.cpp
+++ b/lib/util.cpp
@@ -58,7 +58,7 @@ void Quotient::linkifyUrls(QString& htmlEscapedText)
     // https://matrix.org/docs/spec/appendices.html#identifier-grammar
     static const QRegularExpression MxIdRegExp(
         QStringLiteral(
-            R"((^|[^<>/])([!#@][-a-z0-9_=#/.]{1,252}:(?:\w|\.|-)+\.\w+(?::\d{1,5})?))"),
+            R"((^|[][[:space:](){}`'";])([!#@][-a-z0-9_=#/.]{1,252}:\w(?:\w|\.|-)*\.\w+(?::\d{1,5})?))"),
         RegExpOptions);
     Q_ASSERT(FullUrlRegExp.isValid() && EmailAddressRegExp.isValid()
              && MxIdRegExp.isValid());
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