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diff --git a/src/test/regress/expected/regex.linux.utf8.out b/src/test/regress/expected/regex.linux.utf8.out
new file mode 100644
index 0000000..7c170a9
--- /dev/null
+++ b/src/test/regress/expected/regex.linux.utf8.out
@@ -0,0 +1,164 @@
+/*
+ * This test is for Linux/glibc systems and others that implement proper
+ * locale classification of Unicode characters with high code values.
+ * It must be run in a database with UTF8 encoding and a Unicode-aware locale.
+ */
+SET client_encoding TO UTF8;
+--
+-- Test the "high colormap" logic with single characters and ranges that
+-- exceed the MAX_SIMPLE_CHR cutoff, here assumed to be less than U+2000.
+--
+-- trivial cases:
+SELECT 'aⓐ' ~ U&'a\24D0' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⓐ' ~ U&'a\24D1' AS f;
+ f 
+---
+ f
+(1 row)
+
+SELECT 'aⓕ' ~ 'a[ⓐ-ⓩ]' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⒻ' ~ 'a[ⓐ-ⓩ]' AS f;
+ f 
+---
+ f
+(1 row)
+
+-- cases requiring splitting of ranges:
+SELECT 'aⓕⓕ' ~ 'aⓕ[ⓐ-ⓩ]' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⓕⓐ' ~ 'aⓕ[ⓐ-ⓩ]' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⓐⓕ' ~ 'aⓕ[ⓐ-ⓩ]' AS f;
+ f 
+---
+ f
+(1 row)
+
+SELECT 'aⓕⓕ' ~ 'a[ⓐ-ⓩ]ⓕ' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⓕⓐ' ~ 'a[ⓐ-ⓩ]ⓕ' AS f;
+ f 
+---
+ f
+(1 row)
+
+SELECT 'aⓐⓕ' ~ 'a[ⓐ-ⓩ]ⓕ' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⒶⓜ' ~ 'a[Ⓐ-ⓜ][ⓜ-ⓩ]' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⓜⓜ' ~ 'a[Ⓐ-ⓜ][ⓜ-ⓩ]' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⓜⓩ' ~ 'a[Ⓐ-ⓜ][ⓜ-ⓩ]' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⓩⓩ' ~ 'a[Ⓐ-ⓜ][ⓜ-ⓩ]' AS f;
+ f 
+---
+ f
+(1 row)
+
+SELECT 'aⓜ⓪' ~ 'a[Ⓐ-ⓜ][ⓜ-ⓩ]' AS f;
+ f 
+---
+ f
+(1 row)
+
+SELECT 'a0' ~ 'a[a-ⓩ]' AS f;
+ f 
+---
+ f
+(1 row)
+
+SELECT 'aq' ~ 'a[a-ⓩ]' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⓜ' ~ 'a[a-ⓩ]' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'a⓪' ~ 'a[a-ⓩ]' AS f;
+ f 
+---
+ f
+(1 row)
+
+-- Locale-dependent character classes
+SELECT 'aⒶⓜ⓪' ~ '[[:alpha:]][[:alpha:]][[:alpha:]][[:graph:]]' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⒶⓜ⓪' ~ '[[:alpha:]][[:alpha:]][[:alpha:]][[:alpha:]]' AS f;
+ f 
+---
+ f
+(1 row)
+
+-- Locale-dependent character classes with high ranges
+SELECT 'aⒶⓜ⓪' ~ '[a-z][[:alpha:]][ⓐ-ⓩ][[:graph:]]' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⓜⒶ⓪' ~ '[a-z][[:alpha:]][ⓐ-ⓩ][[:graph:]]' AS f;
+ f 
+---
+ f
+(1 row)
+
+SELECT 'aⓜⒶ⓪' ~ '[a-z][ⓐ-ⓩ][[:alpha:]][[:graph:]]' AS t;
+ t 
+---
+ t
+(1 row)
+
+SELECT 'aⒶⓜ⓪' ~ '[a-z][ⓐ-ⓩ][[:alpha:]][[:graph:]]' AS f;
+ f 
+---
+ f
+(1 row)
+