575   EXPECT_TRUE(MatchRegexAtHead("", ""));  in TEST()
576   EXPECT_TRUE(MatchRegexAtHead("", "ab"));  in TEST()
580   EXPECT_FALSE(MatchRegexAtHead("$", "a"));  in TEST()
582   EXPECT_TRUE(MatchRegexAtHead("$", ""));  in TEST()
583   EXPECT_TRUE(MatchRegexAtHead("a$", "a"));  in TEST()
587   EXPECT_FALSE(MatchRegexAtHead("\\w", "+"));  in TEST()
588   EXPECT_FALSE(MatchRegexAtHead("\\W", "ab"));  in TEST()
590   EXPECT_TRUE(MatchRegexAtHead("\\sa", "\nab"));  in TEST()
591   EXPECT_TRUE(MatchRegexAtHead("\\d", "1a"));  in TEST()
595   EXPECT_FALSE(MatchRegexAtHead(".+a", "abc"));  in TEST()
596   EXPECT_FALSE(MatchRegexAtHead("a?b", "aab"));  in TEST()
598   EXPECT_TRUE(MatchRegexAtHead(".*a", "bc12-ab"));  in TEST()
599   EXPECT_TRUE(MatchRegexAtHead("a?b", "b"));  in TEST()
600   EXPECT_TRUE(MatchRegexAtHead("a?b", "ab"));  in TEST()
605   EXPECT_FALSE(MatchRegexAtHead("\\.+a", "abc"));  in TEST()
606   EXPECT_FALSE(MatchRegexAtHead("\\s?b", "  b"));  in TEST()
608   EXPECT_TRUE(MatchRegexAtHead("\\(*a", "((((ab"));  in TEST()
609   EXPECT_TRUE(MatchRegexAtHead("\\^?b", "^b"));  in TEST()
610   EXPECT_TRUE(MatchRegexAtHead("\\\\?b", "b"));  in TEST()
611   EXPECT_TRUE(MatchRegexAtHead("\\\\?b", "\\b"));  in TEST()
615   EXPECT_FALSE(MatchRegexAtHead("ab.*c", "acabc"));  in TEST()
617   EXPECT_TRUE(MatchRegexAtHead("ab.*c", "ab-fsc"));  in TEST()