Support regular expressions with `--match` (#222)

CHANGELOG.md

@@ -4,6 +4,19 @@ All notable changes to this project will be documented in this file.
 
 ## Unreleased
 
+### Added
+
+* Use regular expressions when searching for notes with `--match`.
+    ```sh
+    # Find notes containing emails.
+    $ zk list --match-strategy re --match ".+@.+"
+    $ zk list -Mr -m ".+@.+"
+    ```
+
+### Changed
+
+* The flags `--exact-match`/`-e` are deprecated in favor of `--match-strategy exact`/`-Me`.
+
 ### Deprecated
 
 * The LSP server does not support resolving a wiki link to a note title anymore.

docs/note-filtering.md

@@ -45,11 +45,35 @@ $ zk list --linked-by "`zk inline journal`"
 
 Use `--match <query>` (or `-m`) to search through the title and body of notes.
 
-The search is powered by a [full-text search](https://en.wikipedia.org/wiki/Full-text_search) database enabling near-instant results. Queries are not case-sensitive and terms are tokenized, which means that searching for `create` will also match `created` and `creating`.
+The search is powered by different strategies to answer various use cases:
+
+* `fts` (default) uses a [full-text search](https://en.wikipedia.org/wiki/Full-text_search) database to offer near-instant results and advanced search operators.
+* `exact` is useful if you need to find patterns containing special characters.
+* `re` enables regular expression for advanced use cases.
+
+Change the currently used strategy with `--match-strategy <strategy>` (or `-M`). To set the default strategy, you can declare a [custom alias](config-alias.md):
+
+```toml
+[alias]
+list = "zk list --match-strategy re $@"
+```
+
+### Full-text search (`fts`)
+
+The default match strategy is powered by a [full-text search](https://en.wikipedia.org/wiki/Full-text_search) database enabling near-instant results. Queries are not case-sensitive and terms are tokenized, which means that searching for `create` will also match `created` and `creating`.
 
 A syntax similar to Google Search is available for advanced search queries.
 
-### Combining terms
+```sh
+# FTS is the default match strategy
+$ zk list --match "tesla OR edison"
+
+# ...but you can enable it explicitly.
+$ zk list --match-strategy fts --match "tesla OR edison"
+$ zk list -Mf -m "tesla OR edison"
+```
+
+#### Combining terms
 
 By default, the search engine will find the notes containing all the terms in the query, in any order.
 
@@ -83,7 +107,7 @@ Finally, you can filter out results by excluding a term with `NOT` (all caps) or
 "tesla -car"
 ```
 
-### Search in specific fields
+#### Search in specific fields
 
 If you want to search only in the title or body of notes, prefix a query with `title:` or `body:`.
 
@@ -92,7 +116,7 @@ If you want to search only in the title or body of notes, prefix a query with `t
 "body: (tesla OR edison)"
 ```
 
-### Prefix terms
+#### Prefix terms
 
 Match any term beginning with the given prefix with a wildcard `*`.
 
@@ -106,13 +130,25 @@ Prefixing a query with `^` will match notes whose title or body start with the f
 "title: ^journal"
 ```
 
-### Search for special characters
+### Exact matches (`exact`)
 
-If you need to find patterns containing special characters, such as an `email@addre.ss` or a `[[wiki-link]]`, use the `--exact-match` / `-e` option. The search will be case-insensitive.
+If you need to find patterns containing special characters, such as an `email@addre.ss` or a `[[wiki-link]]`, use the `exact` match strategy. The search will be case-insensitive.
 
+```sh
+$ zk list --match-strategy exact --match "[[link]]"
+$ zk list -Me -m "[[link]]"
 ```
-$ zk list --exact-match --match "[[link]]"
+
-$ zk list -em "[[link]]"
+### Regular expressions (`re`)
+
+For advanced use cases, you can use the `re` match strategy to search the notebook using regular expressions. The supported syntax is similar to the one used by Python or Perl. [See the full reference](https://golang.org/s/re2syntax).
+
+:warning: Make sure to use quotes to prevent your shell from expanding wildcards.
+
+```sh
+# Find notes containing emails.
+$ zk list --match-strategy re --match ".+@.+"
+$ zk list -Mr -m ".+@.+"
 ```
 
 ## Filter by tags

internal/adapter/sqlite/note_dao.go

@@ -380,8 +380,8 @@ func (d *NoteDAO) expandMentionsIntoMatch(opts core.NoteFindOpts) (core.NoteFind
 	if opts.Mention == nil {
 		return opts, nil
 	}
-	if opts.ExactMatch {
+	if opts.MatchStrategy != core.MatchStrategyFts {
-		return opts, fmt.Errorf("--exact-match and --mention cannot be used together")
+		return opts, fmt.Errorf("--mention can only be used with --match-strategy=fts")
 	}
 
 	// Find the IDs for the mentioned paths.
@@ -518,15 +518,20 @@ func (d *NoteDAO) findRows(opts core.NoteFindOpts, selection noteSelection) (*sq
 	}
 
 	if !opts.Match.IsNull() {
-		if opts.ExactMatch {
+		switch opts.MatchStrategy {
+		case core.MatchStrategyExact:
 			whereExprs = append(whereExprs, `n.raw_content LIKE '%' || ? || '%' ESCAPE '\'`)
 			args = append(args, escapeLikeTerm(opts.Match.String(), '\\'))
-		} else {
+		case core.MatchStrategyFts:
 			snippetCol = `snippet(fts_match.notes_fts, 2, '<zk:match>', '</zk:match>', '…', 20)`
 			joinClauses = append(joinClauses, "JOIN notes_fts fts_match ON n.id = fts_match.rowid")
 			additionalOrderTerms = append(additionalOrderTerms, `bm25(fts_match.notes_fts, 1000.0, 500.0, 1.0)`)
 			whereExprs = append(whereExprs, "fts_match.notes_fts MATCH ?")
 			args = append(args, fts5.ConvertQuery(opts.Match.String()))
+		case core.MatchStrategyRe:
+			whereExprs = append(whereExprs, "n.raw_content REGEXP ?")
+			args = append(args, opts.Match.String())
+			break
 		}
 	}
 

internal/adapter/sqlite/note_dao_test.go

@@ -312,9 +312,10 @@ func TestNoteDAOFindMinimalAll(t *testing.T) {
 func TestNoteDAOFindMinimalWithFilter(t *testing.T) {
 	testNoteDAO(t, func(tx Transaction, dao *NoteDAO) {
 		notes, err := dao.FindMinimal(core.NoteFindOpts{
-			Match:   opt.NewString("daily | index"),
+			Match:         opt.NewString("daily | index"),
-			Sorters: []core.NoteSorter{{Field: core.NoteSortWordCount, Ascending: true}},
+			MatchStrategy: core.MatchStrategyFts,
-			Limit:   3,
+			Sorters:       []core.NoteSorter{{Field: core.NoteSortWordCount, Ascending: true}},
+			Limit:         3,
 		})
 		assert.Nil(t, err)
 
@@ -366,7 +367,10 @@ func TestNoteDAOFindTag(t *testing.T) {
 
 func TestNoteDAOFindMatch(t *testing.T) {
 	testNoteDAOFind(t,
-		core.NoteFindOpts{Match: opt.NewString("daily | index")},
+		core.NoteFindOpts{
+			Match:         opt.NewString("daily | index"),
+			MatchStrategy: core.MatchStrategyFts,
+		},
 		[]core.ContextualNote{
 			{
 				Note: core.Note{
@@ -451,7 +455,8 @@ func TestNoteDAOFindMatch(t *testing.T) {
 func TestNoteDAOFindMatchWithSort(t *testing.T) {
 	testNoteDAOFindPaths(t,
 		core.NoteFindOpts{
-			Match: opt.NewString("daily | index"),
+			Match:         opt.NewString("daily | index"),
+			MatchStrategy: core.MatchStrategyFts,
 			Sorters: []core.NoteSorter{
 				{Field: core.NoteSortPath, Ascending: false},
 			},
@@ -469,8 +474,8 @@ func TestNoteDAOFindExactMatch(t *testing.T) {
 	test := func(match string, expected []string) {
 		testNoteDAOFindPaths(t,
 			core.NoteFindOpts{
-				Match:      opt.NewString(match),
+				Match:         opt.NewString(match),
-				ExactMatch: true,
+				MatchStrategy: core.MatchStrategyExact,
 			},
 			expected,
 		)
@@ -482,13 +487,27 @@ func TestNoteDAOFindExactMatch(t *testing.T) {
 	test(`[exact% ch\ar_acters]`, []string{"ref/test/a.md"})
 }
 
-func TestNoteDAOFindExactMatchCannotBeUsedWithMention(t *testing.T) {
+func TestNoteDAOFindMentionRequiresFtsMatchStrategy(t *testing.T) {
+	testNoteDAO(t, func(tx Transaction, dao *NoteDAO) {
+		_, err := dao.Find(core.NoteFindOpts{
+			MatchStrategy: core.MatchStrategyExact,
+			Mention:       []string{"mention"},
+		})
+		assert.Err(t, err, "--mention can only be used with --match-strategy=fts")
+	})
+	testNoteDAO(t, func(tx Transaction, dao *NoteDAO) {
+		_, err := dao.Find(core.NoteFindOpts{
+			MatchStrategy: core.MatchStrategyRe,
+			Mention:       []string{"mention"},
+		})
+		assert.Err(t, err, "--mention can only be used with --match-strategy=fts")
+	})
 	testNoteDAO(t, func(tx Transaction, dao *NoteDAO) {
 		_, err := dao.Find(core.NoteFindOpts{
-			ExactMatch: true,
+			MatchStrategy: core.MatchStrategyFts,
-			Mention:    []string{"mention"},
+			Mention:       []string{"mention"},
 		})
-		assert.Err(t, err, "--exact-match and --mention cannot be used together")
+		assert.Err(t, err, "could not find notes at: mention")
 	})
 }
 
@@ -559,7 +578,10 @@ func TestNoteDAOFindExcludingMultiplePaths(t *testing.T) {
 
 func TestNoteDAOFindMentions(t *testing.T) {
 	testNoteDAOFind(t,
-		core.NoteFindOpts{Mention: []string{"log/2021-01-03.md", "index.md"}},
+		core.NoteFindOpts{
+			MatchStrategy: core.MatchStrategyFts,
+			Mention:       []string{"log/2021-01-03.md", "index.md"},
+		},
 		[]core.ContextualNote{
 			{
 				Note: core.Note{
@@ -623,7 +645,8 @@ func TestNoteDAOFindMentions(t *testing.T) {
 func TestNoteDAOFindUnlinkedMentions(t *testing.T) {
 	testNoteDAOFindPaths(t,
 		core.NoteFindOpts{
-			Mention: []string{"log/2021-01-03.md", "index.md"},
+			MatchStrategy: core.MatchStrategyFts,
+			Mention:       []string{"log/2021-01-03.md", "index.md"},
 			LinkTo: &core.LinkFilter{
 				Hrefs:  []string{"log/2021-01-03.md", "index.md"},
 				Negate: true,
@@ -636,7 +659,8 @@ func TestNoteDAOFindUnlinkedMentions(t *testing.T) {
 func TestNoteDAOFindMentionUnknown(t *testing.T) {
 	testNoteDAO(t, func(tx Transaction, dao *NoteDAO) {
 		opts := core.NoteFindOpts{
-			Mention: []string{"will-not-be-found"},
+			MatchStrategy: core.MatchStrategyFts,
+			Mention:       []string{"will-not-be-found"},
 		}
 		_, err := dao.Find(opts)
 		assert.Err(t, err, "could not find notes at: will-not-be-found")
@@ -645,7 +669,10 @@ func TestNoteDAOFindMentionUnknown(t *testing.T) {
 
 func TestNoteDAOFindMentionedBy(t *testing.T) {
 	testNoteDAOFind(t,
-		core.NoteFindOpts{MentionedBy: []string{"ref/test/b.md", "log/2021-01-04.md"}},
+		core.NoteFindOpts{
+			MatchStrategy: core.MatchStrategyFts,
+			MentionedBy:   []string{"ref/test/b.md", "log/2021-01-04.md"},
+		},
 		[]core.ContextualNote{
 			{
 				Note: core.Note{
@@ -697,7 +724,8 @@ func TestNoteDAOFindMentionedBy(t *testing.T) {
 func TestNoteDAOFindUnlinkedMentionedBy(t *testing.T) {
 	testNoteDAOFindPaths(t,
 		core.NoteFindOpts{
-			MentionedBy: []string{"ref/test/b.md", "log/2021-01-04.md"},
+			MatchStrategy: core.MatchStrategyFts,
+			MentionedBy:   []string{"ref/test/b.md", "log/2021-01-04.md"},
 			LinkedBy: &core.LinkFilter{
 				Hrefs:  []string{"ref/test/b.md", "log/2021-01-04.md"},
 				Negate: true,
@@ -710,7 +738,8 @@ func TestNoteDAOFindUnlinkedMentionedBy(t *testing.T) {
 func TestNoteDAOFindMentionedByUnknown(t *testing.T) {
 	testNoteDAO(t, func(tx Transaction, dao *NoteDAO) {
 		opts := core.NoteFindOpts{
-			MentionedBy: []string{"will-not-be-found"},
+			MatchStrategy: core.MatchStrategyFts,
+			MentionedBy:   []string{"will-not-be-found"},
 		}
 		_, err := dao.Find(opts)
 		assert.Err(t, err, "could not find notes at: will-not-be-found")

internal/cli/container.go

@@ -139,6 +139,10 @@ func NewContainer(version string) (*Container, error) {
 // XDG Base Directory specification
 // https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
 func locateGlobalConfig() (string, error) {
+	if _, ok := os.LookupEnv("RUNNING_TESH"); ok {
+		return "", nil
+	}
+
 	configPath := filepath.Join(globalConfigDir(), "config.toml")
 	exists, err := paths.Exists(configPath)
 	switch {

internal/cli/filtering.go

@@ -20,7 +20,7 @@ type Filtering struct {
 	Interactive    bool     `kong:"group='filter',short='i',help='Select notes interactively with fzf.'" json:"-"`
 	Limit          int      `kong:"group='filter',short='n',placeholder='COUNT',help='Limit the number of notes found.'" json:"limit"`
 	Match          string   `kong:"group='filter',short='m',placeholder='QUERY',help='Terms to search for in the notes.'" json:"match"`
-	ExactMatch     bool     `kong:"group='filter',short='e',help='Search for exact occurrences of the --match argument (case insensitive).'" json:"exactMatch"`
+	MatchStrategy  string   `kong:"group='filter',short='M',default='fts',placeholder='STRATEGY',help='Text matching strategy among: fts, re, exact.'" json:"matchStrategy"`
 	Exclude        []string `kong:"group='filter',short='x',placeholder='PATH',help='Ignore notes matching the given path, including its descendants.'" json:"excludeHrefs"`
 	Tag            []string `kong:"group='filter',short='t',help='Find notes tagged with the given tags.'" json:"tags"`
 	Mention        []string `kong:"group='filter',placeholder='PATH',help='Find notes mentioning the title of the given ones.'" json:"mention"`
@@ -41,6 +41,9 @@ type Filtering struct {
 	ModifiedAfter  string   `kong:"group='filter',placeholder='DATE',help='Find notes modified after the given date.'" json:"modifiedAfter"`
 
 	Sort []string `kong:"group='sort',short='s',placeholder='TERM',help='Order the notes by the given criterion.'" json:"sort"`
+
+	// Deprecated
+	ExactMatch bool `kong:"hidden,short='e'" json:"exactMatch"`
 }
 
 // ExpandNamedFilters expands recursively any named filter found in the Path field.
@@ -119,6 +122,9 @@ func (f Filtering) ExpandNamedFilters(filters map[string]string, expandedFilters
 			} else if parsedFilter.Match != "" {
 				f.Match = fmt.Sprintf("(%s) AND (%s)", f.Match, parsedFilter.Match)
 			}
+			if f.MatchStrategy == "" {
+				f.MatchStrategy = parsedFilter.MatchStrategy
+			}
 
 		} else {
 			actualPaths = append(actualPaths, path)
@@ -138,8 +144,15 @@ func (f Filtering) NewNoteFindOpts(notebook *core.Notebook) (core.NoteFindOpts,
 		return opts, err
 	}
 
+	if f.ExactMatch {
+		return opts, fmt.Errorf("the --exact-match (-e) option is deprecated, use --match-strategy=exact (-Me) instead")
+	}
+
 	opts.Match = opt.NewNotEmptyString(f.Match)
-	opts.ExactMatch = f.ExactMatch
+	opts.MatchStrategy, err = core.MatchStrategyFromString(f.MatchStrategy)
+	if err != nil {
+		return opts, err
+	}
 
 	if paths, ok := relPaths(notebook, f.Path); ok {
 		opts.IncludeHrefs = paths

internal/core/note_find.go

@@ -11,10 +11,10 @@ import (
 
 // NoteFindOpts holds a set of filtering options used to find notes.
 type NoteFindOpts struct {
-	// Filter used to match the notes with FTS predicates.
+	// Filter used to match the notes with the given MatchStrategy.
 	Match opt.String
-	// Search for exact occurrences of the Match string.
+	// Text matching strategy used with Match.
-	ExactMatch bool
+	MatchStrategy MatchStrategy
 	// Filter by note hrefs.
 	IncludeHrefs []string
 	// Filter excluding notes at the given hrefs.
@@ -161,3 +161,29 @@ func NoteSorterFromString(str string) (NoteSorter, error) {
 
 	return sorter, nil
 }
+
+// MatchStrategy represents a text matching strategy used when filtering notes with `--match`.
+type MatchStrategy int
+
+const (
+	// Full text search.
+	MatchStrategyFts MatchStrategy = iota + 1
+	// Exact text matching.
+	MatchStrategyExact
+	// Regular expression.
+	MatchStrategyRe
+)
+
+// MatchStrategyFromString returns a MatchStrategy from its string representation.
+func MatchStrategyFromString(str string) (MatchStrategy, error) {
+	switch str {
+	case "fts", "f", "":
+		return MatchStrategyFts, nil
+	case "re", "grep", "r":
+		return MatchStrategyRe, nil
+	case "exact", "e":
+		return MatchStrategyExact, nil
+	default:
+		return 0, fmt.Errorf("%s: unknown match strategy\ntry fts (full-text search), re (regular expression) or exact", str)
+	}
+}

internal/core/note_find_test.go

@@ -67,3 +67,24 @@ func TestSortersFromStrings(t *testing.T) {
 	_, err := NoteSortersFromStrings([]string{"c", "foobar"})
 	assert.Err(t, err, "foobar: unknown sorting term")
 }
+
+func TestMatchStrategyFromString(t *testing.T) {
+	test := func(str string, expected MatchStrategy) {
+		actual, err := MatchStrategyFromString(str)
+		assert.Nil(t, err)
+		assert.Equal(t, actual, expected)
+	}
+
+	test("f", MatchStrategyFts)
+	test("fts", MatchStrategyFts)
+
+	test("r", MatchStrategyRe)
+	test("re", MatchStrategyRe)
+	test("grep", MatchStrategyRe)
+
+	test("e", MatchStrategyExact)
+	test("exact", MatchStrategyExact)
+
+	_, err := MatchStrategyFromString("foobar")
+	assert.Err(t, err, "foobar: unknown match strategy\ntry fts (full-text search), re (regular expression) or exact")
+}

tests/cmd-graph.tesh

@@ -25,8 +25,7 @@ $ zk graph --help
 >  -i, --interactive              Select notes interactively with fzf.
 >  -n, --limit=COUNT              Limit the number of notes found.
 >  -m, --match=QUERY              Terms to search for in the notes.
->  -e, --exact-match              Search for exact occurrences of the --match
+>  -M, --match-strategy="fts"     Text matching strategy among: fts, re, exact.
->                                 argument (case insensitive).
 >  -x, --exclude=PATH,...         Ignore notes matching the given path, including
 >                                 its descendants.
 >  -t, --tag=TAG,...              Find notes tagged with the given tags.

tests/cmd-list-filter-match-exact.tesh

@@ -0,0 +1,17 @@
+# Exact search match strategy.
+
+$ cd full-sample
+
+# Long flag.
+$ zk list -q --debug-style --match-strategy exact --match '["न", "म", "स्", "ते"]'
+><title>Strings are a complicated data structure</title> <path>oumc.md</path> (just now)
+>
+>  - Given the Hindi word "नमस्ते":
+>
+
+# Short flag.
+$ zk list -q --debug-style -Me --match '["न", "म", "स्", "ते"]'
+><title>Strings are a complicated data structure</title> <path>oumc.md</path> (just now)
+>
+>  - Given the Hindi word "नमस्ते":
+>

tests/cmd-list-filter-match-fts.tesh

@@ -0,0 +1,113 @@
+# Full-text search match strategy.
+
+$ cd full-sample
+
+# Search for a multi-word term.
+$ zk list -q --debug-style --match '"green thread"'
+><title>Green threads</title> <path>inbox/my59.md</path> (just now)
+>
+>  - …Programming language-provided threads are known as <term>green threads</term>, and languages that use these <term>green threads</term> will execute them in…
+>
+><title>Concurrency in Rust</title> <path>g7qa.md</path> (just now)
+>
+>  - …so it doesn't support [<term>green threads</term>](inbox/my59).
+>        *   Crates exist to add support for <term>green threads</term> if needed.
+>        *   Instead, Rust relies…
+>
+
+# Search for two terms (defaults to AND).
+$ zk list -q --debug-style --match 'green channel'
+><title>Concurrency in Rust</title> <path>g7qa.md</path> (just now)
+>
+>  - …runtime, so it doesn't support [<term>green</term> threads](inbox/my59).
+>        *   Crates exist to add support for <term>green</term> threads if needed.
+>        *   Instead, Rust…
+>
+
+# Search for two terms with explicit AND.
+$ zk list -q --debug-style --match 'green AND channel'
+><title>Concurrency in Rust</title> <path>g7qa.md</path> (just now)
+>
+>  - …runtime, so it doesn't support [<term>green</term> threads](inbox/my59).
+>        *   Crates exist to add support for <term>green</term> threads if needed.
+>        *   Instead, Rust…
+>
+
+# Search for two terms with OR.
+$ zk list -q --debug-style --match 'green OR channel'
+><title>Green threads</title> <path>inbox/my59.md</path> (just now)
+>
+>  - …Programming language-provided threads are known as <term>green</term> threads, and languages that use these <term>green</term> threads will execute them in…
+>
+><title>Concurrency in Rust</title> <path>g7qa.md</path> (just now)
+>
+>  - …runtime, so it doesn't support [<term>green</term> threads](inbox/my59).
+>        *   Crates exist to add support for <term>green</term> threads if needed.
+>        *   Instead, Rust…
+>
+><title>Channel</title> <path>fwsj.md</path> (just now)
+>
+>  - *   <term>Channels</term> are a great approach for safe concurrency.
+>    *   It's an implementation of the [message passing](4oma) pattern.
+>    
+>    :programming:
+>
+><title>Message passing</title> <path>4oma.md</path> (just now)
+>
+>  - *   A popular approach for safe concurrency is to use *message passing* instead of shared state.
+>    *   <term>Channels</term> are an example of…
+>
+><title>Mutex</title> <path>inbox/er4k.md</path> (just now)
+>
+>  - …with a *locking system*.
+>    *   Managing mutexes is tricky, using [<term>channels</term>](../fwsj) is an easier alternative.
+>        *   The main risk is to…
+>
+
+# Exclude a term.
+$ zk list -q --debug-style --match 'green -channel'
+><title>Green threads</title> <path>inbox/my59.md</path> (just now)
+>
+>  - …Programming language-provided threads are known as <term>green</term> threads, and languages that use these <term>green</term> threads will execute them in…
+>
+
+# Search in the `title` field.
+$ zk list -q --debug-style --match 'title:(green thread)'
+><title>Green threads</title> <path>inbox/my59.md</path> (just now)
+>
+>  - > Many operating systems provide an API for creating new threads. This model where a language calls the operating system APIs…
+>
+
+# Search with a prefix in `title`.
+$ zk list -q --debug-style --match 'title:^do*'
+><title>Do not communicate by sharing memory; instead, share memory by communicating</title> <path>ref/7fto.md</path> (just now)
+>
+>  - *   Advocates for the use of [message passing](4oma) instead of shared state.
+>    *   A slogan initially coined by Rob Pike ([Effective…
+>
+><title>Don't speculate</title> <path>pywo.md</path> (just now)
+>
+>  - You have more to loose by doing market timing (jumping in and out of the stocks market). Remember, [the less…
+>
+
+# Search with a prefix.
+$ zk list -q --debug-style --match 'mut*'
+><title>Mutex</title> <path>inbox/er4k.md</path> (just now)
+>
+>  - *   Abbreviation of *<term>mutual</term> exclusion*.
+>    *   An approach to manage safely shared state by allowing only a single thread to access a…
+>
+><title>Data race error</title> <path>3403.md</path> (just now)
+>
+>  - …Rust prevents *data races* by allowing only a single <term>mutable</term> reference of a value per scope.
+>    
+>    :programming:
+>
+><title>Concurrency in Rust</title> <path>g7qa.md</path> (just now)
+>
+>  - …data between threads:
+>        *   [Channel](fwsj) for a safe [message passing](4oma) approach.
+>        *   [<term>Mutex</term>](inbox/er4k) for managing shared state.
+>    
+>    :rust:programming:
+>

tests/cmd-list-filter-match-re.tesh

@@ -0,0 +1,17 @@
+# Regular expression match strategy.
+
+$ cd full-sample
+
+# Long flag.
+$ zk list -q --debug-style --match-strategy re --match 'न.*ते'
+><title>Strings are a complicated data structure</title> <path>oumc.md</path> (just now)
+>
+>  - Given the Hindi word "नमस्ते":
+>
+
+# Short flag.
+$ zk list -q --debug-style -Mr --match 'न.*ते'
+><title>Strings are a complicated data structure</title> <path>oumc.md</path> (just now)
+>
+>  - Given the Hindi word "नमस्ते":
+>

tests/cmd-list-filter-match.tesh

@@ -1,126 +1,9 @@
-$ cd full-sample
+$ cd blank
 
-# Search for a multi-word term.
+# --exact-match is deprecated.
-$ zk list -q --debug-style --match '"green thread"'
+1$ zk list -q --exact-match
-><title>Green threads</title> <path>inbox/my59.md</path> (just now)
+2>zk: error: incorrect criteria: the --exact-match (-e) option is deprecated, use --match-strategy=exact (-Me) instead
->
->  - …Programming language-provided threads are known as <term>green threads</term>, and languages that use these <term>green threads</term> will execute them in…
->
-><title>Concurrency in Rust</title> <path>g7qa.md</path> (just now)
->
->  - …so it doesn't support [<term>green threads</term>](inbox/my59).
->        *   Crates exist to add support for <term>green threads</term> if needed.
->        *   Instead, Rust relies…
->
-
-# Search for two terms (defaults to AND).
-$ zk list -q --debug-style --match 'green channel'
-><title>Concurrency in Rust</title> <path>g7qa.md</path> (just now)
->
->  - …runtime, so it doesn't support [<term>green</term> threads](inbox/my59).
->        *   Crates exist to add support for <term>green</term> threads if needed.
->        *   Instead, Rust…
->
-
-# Search for two terms with explicit AND.
-$ zk list -q --debug-style --match 'green AND channel'
-><title>Concurrency in Rust</title> <path>g7qa.md</path> (just now)
->
->  - …runtime, so it doesn't support [<term>green</term> threads](inbox/my59).
->        *   Crates exist to add support for <term>green</term> threads if needed.
->        *   Instead, Rust…
->
-
-# Search for two terms with OR.
-$ zk list -q --debug-style --match 'green OR channel'
-><title>Green threads</title> <path>inbox/my59.md</path> (just now)
->
->  - …Programming language-provided threads are known as <term>green</term> threads, and languages that use these <term>green</term> threads will execute them in…
->
-><title>Concurrency in Rust</title> <path>g7qa.md</path> (just now)
->
->  - …runtime, so it doesn't support [<term>green</term> threads](inbox/my59).
->        *   Crates exist to add support for <term>green</term> threads if needed.
->        *   Instead, Rust…
->
-><title>Channel</title> <path>fwsj.md</path> (just now)
->
->  - *   <term>Channels</term> are a great approach for safe concurrency.
->    *   It's an implementation of the [message passing](4oma) pattern.
->    
->    :programming:
->
-><title>Message passing</title> <path>4oma.md</path> (just now)
->
->  - *   A popular approach for safe concurrency is to use *message passing* instead of shared state.
->    *   <term>Channels</term> are an example of…
->
-><title>Mutex</title> <path>inbox/er4k.md</path> (just now)
->
->  - …with a *locking system*.
->    *   Managing mutexes is tricky, using [<term>channels</term>](../fwsj) is an easier alternative.
->        *   The main risk is to…
->
-
-# Exclude a term.
-$ zk list -q --debug-style --match 'green -channel'
-><title>Green threads</title> <path>inbox/my59.md</path> (just now)
->
->  - …Programming language-provided threads are known as <term>green</term> threads, and languages that use these <term>green</term> threads will execute them in…
->
-
-# Search in the `title` field.
-$ zk list -q --debug-style --match 'title:(green thread)'
-><title>Green threads</title> <path>inbox/my59.md</path> (just now)
->
->  - > Many operating systems provide an API for creating new threads. This model where a language calls the operating system APIs…
->
-
-# Search with a prefix in `title`.
-$ zk list -q --debug-style --match 'title:^do*'
-><title>Do not communicate by sharing memory; instead, share memory by communicating</title> <path>ref/7fto.md</path> (just now)
->
->  - *   Advocates for the use of [message passing](4oma) instead of shared state.
->    *   A slogan initially coined by Rob Pike ([Effective…
->
-><title>Don't speculate</title> <path>pywo.md</path> (just now)
->
->  - You have more to loose by doing market timing (jumping in and out of the stocks market). Remember, [the less…
->
-
-# Search with a prefix.
-$ zk list -q --debug-style --match 'mut*'
-><title>Mutex</title> <path>inbox/er4k.md</path> (just now)
->
->  - *   Abbreviation of *<term>mutual</term> exclusion*.
->    *   An approach to manage safely shared state by allowing only a single thread to access a…
->
-><title>Data race error</title> <path>3403.md</path> (just now)
->
->  - …Rust prevents *data races* by allowing only a single <term>mutable</term> reference of a value per scope.
->    
->    :programming:
->
-><title>Concurrency in Rust</title> <path>g7qa.md</path> (just now)
->
->  - …data between threads:
->        *   [Channel](fwsj) for a safe [message passing](4oma) approach.
->        *   [<term>Mutex</term>](inbox/er4k) for managing shared state.
->    
->    :rust:programming:
->
-
-# Search for an exact match.
-$ zk list -q --debug-style --exact-match --match '["न", "म", "स्", "ते"]'
-><title>Strings are a complicated data structure</title> <path>oumc.md</path> (just now)
->
->  - Given the Hindi word "नमस्ते":
->
-
-# Search for an exact match (short flag).
-$ zk list -q --debug-style -em '["न", "म", "स्", "ते"]'
-><title>Strings are a complicated data structure</title> <path>oumc.md</path> (just now)
->
->  - Given the Hindi word "नमस्ते":
->
 
+# --exact-match is deprecated (short flag).
+1$ zk list -q -e
+2>zk: error: incorrect criteria: the --exact-match (-e) option is deprecated, use --match-strategy=exact (-Me) instead

tests/cmd-list.tesh

@@ -33,8 +33,7 @@ $ zk list --help
 >  -i, --interactive              Select notes interactively with fzf.
 >  -n, --limit=COUNT              Limit the number of notes found.
 >  -m, --match=QUERY              Terms to search for in the notes.
->  -e, --exact-match              Search for exact occurrences of the --match
+>  -M, --match-strategy="fts"     Text matching strategy among: fts, re, exact.
->                                 argument (case insensitive).
 >  -x, --exclude=PATH,...         Ignore notes matching the given path, including
 >                                 its descendants.
 >  -t, --tag=TAG,...              Find notes tagged with the given tags.