}

	return filter
}

type escapeCheck struct {
	canSkipRegex     bool
	invalidCharFound bool
}

// skipRegexCheck checks if escape would be skipped.
// if invalidCharFound is true, it must have invalid character; if invalidCharFound is false, not sure if it has invalid character or not
func skipRegexCheck(ident string) escapeCheck {
	escapeCheck := escapeCheck{canSkipRegex: true, invalidCharFound: false}
	// skip escape if possible

		// if escape keyword is detected before invalid character, invalidCharFound
		{unescaped: "/👑", canSkip: false},
	}

	for _, tc := range cases {
		t.Run(tc.unescaped, func(t *testing.T) {
			escapeCheck := skipRegexCheck(tc.unescaped)
			if escapeCheck.invalidCharFound {
				if escapeCheck.invalidCharFound != tc.invalidCharFound {
					t.Errorf("Expected input validation to be %v, but got %t", tc.invalidCharFound, escapeCheck.invalidCharFound)