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diff --git a/t/t7813-grep-icase-iso.sh b/t/t7813-grep-icase-iso.sh
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+#!/bin/sh
+
+test_description='grep icase on non-English locales'
+
+. ./lib-gettext.sh
+
+test_expect_success GETTEXT_ISO_LOCALE 'setup' '
+	printf "TILRAUN: Halló Heimur!" >file &&
+	git add file &&
+	LC_ALL="$is_IS_iso_locale" &&
+	export LC_ALL
+'
+
+test_expect_success GETTEXT_ISO_LOCALE,PCRE 'grep pcre string' '
+	git grep --perl-regexp -i "TILRAUN: H.lló Heimur!" &&
+	git grep --perl-regexp -i "TILRAUN: H.LLÓ HEIMUR!"
+'
+
+test_done