Replace the like query where clause with the RegExp

like.ts

@@ -0,0 +1,7 @@
+export function getLikeRegExp(input: string): RegExp {
+  const pattern = input
+    .replaceAll(".", "\\.")
+    .replaceAll("%", ".*?");
+
+  return new RegExp("^" + pattern + "$");
+}

like_test.ts

@@ -0,0 +1,91 @@
+import { assert, assertEquals } from "./deps.ts";
+import { getLikeRegExp } from "./like.ts";
+
+Deno.test("where name like 'abc.txt'", () => {
+  const regexp = getLikeRegExp("abc.txt");
+
+  /* Match */
+  assert("abc.txt".match(regexp));
+
+  /* Does not match */
+  assertEquals("a.txt".match(regexp), null);
+  assertEquals("abc_d.txt".match(regexp), null);
+  assertEquals("abc.tx".match(regexp), null);
+});
+
+Deno.test("where name like '%.txt'", () => {
+  const regexp = getLikeRegExp("%.txt");
+
+  /* Match */
+  assert("abc.txt".match(regexp));
+  assert("c.txt".match(regexp));
+  assert("ab_c.txt".match(regexp));
+  assert("ab_-\/*+ddc.txt".match(regexp));
+
+  /* Does not match */
+  assertEquals("abc.bin".match(regexp), null);
+  assertEquals(".txn".match(regexp), null);
+  assertEquals("abc_txt".match(regexp), null);
+  assertEquals("abc.!txt".match(regexp), null);
+  assertEquals("abc.txt_bin".match(regexp), null);
+});
+
+Deno.test("where name like '%.txt%'", () => {
+  const regexp = getLikeRegExp("%.txt%");
+
+  /* Match */
+  assert("abc.txt".match(regexp));
+  assert("c.txt".match(regexp));
+  assert("ab_c.txt".match(regexp));
+  assert("ab_-\/*+ddc.txt".match(regexp));
+
+  /* Does not match */
+  assertEquals("abc.bin".match(regexp), null);
+  assertEquals(".txn".match(regexp), null);
+  assertEquals("abc_txt".match(regexp), null);
+});
+
+Deno.test("where name like 'ab%txt'", () => {
+  const regexp = getLikeRegExp("ab%txt");
+
+  /* Match */
+  assert("abc.txt".match(regexp));
+  assert("abdef_.txt".match(regexp));
+  assert("ab_c.txt".match(regexp));
+  assert("ab_-\/*+ddc.txt".match(regexp));
+
+  /* Does not match */
+  assertEquals("abc.bin".match(regexp), null);
+  assertEquals("abc".match(regexp), null);
+  assertEquals("d_abc.txt".match(regexp), null);
+  assertEquals("abc.txt.".match(regexp), null);
+  assertEquals("abc.txt!".match(regexp), null);
+});
+
+Deno.test("where name like 'abc.%'", () => {
+  const regexp = getLikeRegExp("abc.%");
+
+  /* Match */
+  assert("abc.txt".match(regexp));
+  assert("abc.bin".match(regexp));
+  assert("abc.".match(regexp));
+
+  /* Does not match */
+  assertEquals("abc".match(regexp), null);
+  assertEquals("d".match(regexp), null);
+  assertEquals("abc?.".match(regexp), null);
+});
+
+Deno.test("where name like '%.%'", () => {
+  const regexp = getLikeRegExp("%.%");
+
+  /* Match */
+  assert("abc.txt".match(regexp));
+  assert("abc.bin".match(regexp));
+  assert("abc.".match(regexp));
+  assert(".".match(regexp));
+  assert(".txt".match(regexp));
+
+  /* Does not match */
+  assertEquals("abc".match(regexp), null);
+});

mod_test.ts

@@ -4,7 +4,7 @@ import { fsselect } from "./mod.ts";
 
 Deno.test("if 'select * from .' works", async () => {
   const result = await fsselect("select * from .");
-  assert(result.length === 18);
+  assert(result.length === 20);
 });
 
 Deno.test("if 'select * from root' works", async () => {