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+dnl @ ../doc/m4.texi:6029: Origin of test
+dnl @ expected status: 0
+dnl @ extra options:
+dnl @ Copyright (C) 2006, 2007, 2008, 2009 Free Software
+dnl @ Foundation, Inc.
+dnl @ This file is free software; the Free Software Foundation
+dnl @ gives unlimited permission to copy and/or distribute it
+dnl @ with or without modifications, as long as this notice
+dnl @ is preserved.
+define(`patreg',
+`patsubst($@)
+regexp($@)')dnl
+patreg(`bar foo baz Foo', `foo\|Foo', `FOO')
+dnl @result{}bar FOO baz FOO
+dnl @result{}FOO
+patreg(`aba abb 121', `\(.\)\(.\)\1', `\2\1\2')
+dnl @result{}bab abb 212
+dnl @result{}bab