add support for literal token match, use levenshtein fuzzy mod

table/filter.go

@@ -107,6 +107,8 @@ func filterFuncContains(input FilterFuncInput) bool {
 
 // filterFuncFuzzy returns a filterFunc that performs case-insensitive fuzzy
 // matching (subsequence) over the concatenation of all filterable column values.
+// it supports multiple filter tokens separated by space which must all match.
+// also, if a filter token starts with the quote character (') it has to match literally.
 func filterFuncFuzzy(input FilterFuncInput) bool {
 	filter := strings.TrimSpace(input.Filter)
 	if filter == "" {
@@ -135,6 +137,15 @@ func filterFuncFuzzy(input FilterFuncInput) bool {
 	}
 
 	for _, token := range strings.Fields(strings.ToLower(filter)) {
+		if token[0] == '\'' && len(token) > 1 {
+			// compare literally
+			if !strings.Contains(haystack, strings.ToLower(token[1:])) {
+				return false
+			}
+
+			continue
+		}
+
 		if !fuzzySubsequenceMatch(haystack, token) {
 			return false
 		}

table/filter_test.go

@@ -563,3 +563,36 @@ func TestFuzzySubSequenceMatch_EmptyString(t *testing.T) {
 	assert.False(t, fuzzySubsequenceMatch("", "a"), "non-empty needle should not match empty haystack")
 	assert.True(t, fuzzySubsequenceMatch("", ""), "empty needle should match empty haystack")
 }
+
+func TestFuzzyFilter_LiteralMatches(t *testing.T) {
+	cols := []Column{
+		NewColumn("name", "Name", 10).WithFiltered(true),
+		NewColumn("city", "City", 10).WithFiltered(true),
+	}
+	row := NewRow(RowData{
+		"name": "Acme",
+		"city": "Stuttgart",
+	})
+
+	type testCase struct {
+		name        string
+		filter      string
+		shouldMatch bool
+	}
+
+	testCases := []testCase{
+		{"literal match", "'Stutt", true},
+		{"failing literal match", "'Stutgar", false},
+		{"combined literal match", "'Stut tat", true},
+		{"invalid literal filter", "'", false},
+		{"invalid literal filter plus fuzzy", "' z", false},
+	}
+
+	for _, tc := range testCases {
+		assert.Equal(t, tc.shouldMatch, filterFuncFuzzy(FilterFuncInput{
+			Columns: cols,
+			Row:     row,
+			Filter:  tc.filter,
+		}))
+	}
+}