From 7abe6e67f9842bfe32c11efafbf9bc8395f0bbf9 Mon Sep 17 00:00:00 2001
From: P-SiZK <54477535+P-SiZK@users.noreply.github.com>
Date: Mon, 5 Jan 2026 04:34:10 +0900
Subject: [PATCH 1/2] Fix Elixir sigil interpolation

---
 lib/rouge/lexers/elixir.rb |  2 +-
 spec/visual/samples/elixir | 14 +++++++-------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/lib/rouge/lexers/elixir.rb b/lib/rouge/lexers/elixir.rb
index c48b65350b..c79ca86a48 100644
--- a/lib/rouge/lexers/elixir.rb
+++ b/lib/rouge/lexers/elixir.rb
@@ -107,7 +107,7 @@ def self.detect?(text)
         rule %r/~([A-Za-z])?(#{sigil_opens})/ do |m|
           open = Regexp.escape(m[2])
           close = Regexp.escape(delimiter_map[m[2]] || m[2])
-          interp = /[SRCW]/ === m[1]
+          interp = /[srcw]/ === m[1]
           toktype = Str::Other
 
           puts "    open: #{open.inspect}" if @debug
diff --git a/spec/visual/samples/elixir b/spec/visual/samples/elixir
index ac3bb253d1..c2c13895ea 100644
--- a/spec/visual/samples/elixir
+++ b/spec/visual/samples/elixir
@@ -63,13 +63,13 @@ string |> String.split(~r/[ -]/) |> Enum.map(&abbreviate_word/1) |> Enum.join()
 ~c||
 ~c//
 
-~S(inter #{pol <> "ati#{o}"} n)
-~S[inter #{pol <> "ati#{o}"} n]
-~S<inter #{pol <> "ati#{o}"} n>
-~S'inter #{pol <> "ati#{o}"} n'
-~S"inter #{pol <> "ati#{o}"} n"
-~S|inter #{pol <> "ati#{o}"} n|
-~S/inter #{pol <> "ati#{o}"} n/
+~s(inter #{pol <> "ati#{o}"} n)
+~s[inter #{pol <> "ati#{o}"} n]
+~s<inter #{pol <> "ati#{o}"} n>
+~s'inter #{pol <> "ati#{o}"} n'
+~s"inter #{pol <> "ati#{o}"} n"
+~s|inter #{pol <> "ati#{o}"} n|
+~s/inter #{pol <> "ati#{o}"} n/
 
 # first is Operator, second is &1 variable
 &(&1)

From 163bcbac134179576ba7ed821baeb7e3a0ac7593 Mon Sep 17 00:00:00 2001
From: P-SiZK <54477535+P-SiZK@users.noreply.github.com>
Date: Mon, 5 Jan 2026 04:34:48 +0900
Subject: [PATCH 2/2] Fix Elixir lexer sigil pattern to match specification

---
 lib/rouge/lexers/elixir.rb | 12 ++++++------
 spec/visual/samples/elixir |  5 +++++
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/lib/rouge/lexers/elixir.rb b/lib/rouge/lexers/elixir.rb
index c79ca86a48..06722bb2aa 100644
--- a/lib/rouge/lexers/elixir.rb
+++ b/lib/rouge/lexers/elixir.rb
@@ -99,27 +99,27 @@ def self.detect?(text)
 
       state :sigil_strings do
         # ~-sigiled strings
-        # ~(abc), ~[abc], ~<abc>, ~|abc|, ~r/abc/, etc
+        # ~r(abc), ~r[abc], ~r<abc>, ~r|abc|, ~r/abc/, etc
         # Cribbed and adjusted from Ruby lexer
         delimiter_map = { '{' => '}', '[' => ']', '(' => ')', '<' => '>' }
-        # Match a-z for custom sigils too
         sigil_opens = Regexp.union(delimiter_map.keys + %w(| / ' "))
-        rule %r/~([A-Za-z])?(#{sigil_opens})/ do |m|
+        # Match [a-z] or [A-Z][A-Z0-9]* for custom sigils too
+        rule %r/~([a-z]|[A-Z][A-Z0-9]*)(#{sigil_opens})/ do |m|
           open = Regexp.escape(m[2])
           close = Regexp.escape(delimiter_map[m[2]] || m[2])
-          interp = /[srcw]/ === m[1]
+          interp = /^[srcw]$/ === m[1]
           toktype = Str::Other
 
           puts "    open: #{open.inspect}" if @debug
           puts "    close: #{close.inspect}" if @debug
 
           # regexes
-          if 'Rr'.include? m[1]
+          if m[1] == 'r' || m[1] == 'R'
             toktype = Str::Regex
             push :regex_flags
           end
 
-          if 'Ww'.include? m[1]
+          if m[1] == 'w' || m[1] == 'W'
             push :list_flags
           end
 
diff --git a/spec/visual/samples/elixir b/spec/visual/samples/elixir
index c2c13895ea..9648dfdfd4 100644
--- a/spec/visual/samples/elixir
+++ b/spec/visual/samples/elixir
@@ -71,6 +71,11 @@ string |> String.split(~r/[ -]/) |> Enum.map(&abbreviate_word/1) |> Enum.join()
 ~s|inter #{pol <> "ati#{o}"} n|
 ~s/inter #{pol <> "ati#{o}"} n/
 
+# custom sigils
+~i(13)
+~CUSTOM(custom uppercase)
+~ABC123(with digits)
+
 # first is Operator, second is &1 variable
 &(&1)