diff --git a/.gitignore b/.gitignore
index 083314b..2ba2750 100644
--- a/.gitignore
+++ b/.gitignore
@@ -144,3 +144,5 @@ dist
 .svelte-kit
 
 # End of https://www.toptal.com/developers/gitignore/api/node
+
+src/generated
\ No newline at end of file
diff --git a/flake.nix b/flake.nix
index 63eedc2..ccc2063 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,7 +4,6 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
-    flake-utils.inputs.nixpkgs.follows = "nixpkgs";
   };
 
   outputs = {
diff --git a/grammar/task.pegjs b/grammar/task.pegjs
new file mode 100644
index 0000000..0087134
--- /dev/null
+++ b/grammar/task.pegjs
@@ -0,0 +1 @@
+start = ('a' / 'b')+
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 0d7808e..3d90be3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,6 +8,9 @@
       "name": "obsidian-tasks-reminder",
       "version": "0.0.1",
       "license": "ISC",
+      "dependencies": {
+        "peggy": "^4.2.0"
+      },
       "bin": {
         "obsidian-tasks-reminder": "dist/index.js"
       },
@@ -464,6 +467,18 @@
         "node": ">= 8"
       }
     },
+    "node_modules/@peggyjs/from-mem": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/@peggyjs/from-mem/-/from-mem-1.3.5.tgz",
+      "integrity": "sha512-oRyzXE7nirAn+5yYjCdWQHg3EG2XXcYRoYNOK8Quqnmm+9FyK/2YWVunwudlYl++M3xY+gIAdf0vAYS+p0nKfQ==",
+      "license": "MIT",
+      "dependencies": {
+        "semver": "7.6.3"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@types/node": {
       "version": "22.10.6",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-22.10.6.tgz",
@@ -828,6 +843,32 @@
         "node": ">=8"
       }
     },
+    "node_modules/peggy": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/peggy/-/peggy-4.2.0.tgz",
+      "integrity": "sha512-ZjzyJYY8NqW8JOZr2PbS/J0UH/hnfGALxSDsBUVQg5Y/I+ZaPuGeBJ7EclUX2RvWjhlsi4pnuL1C/K/3u+cDeg==",
+      "license": "MIT",
+      "dependencies": {
+        "@peggyjs/from-mem": "1.3.5",
+        "commander": "^12.1.0",
+        "source-map-generator": "0.8.0"
+      },
+      "bin": {
+        "peggy": "bin/peggy.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/peggy/node_modules/commander": {
+      "version": "12.1.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-12.1.0.tgz",
+      "integrity": "sha512-Vw8qHK3bZM9y/P10u3Vib8o/DdkvA2OtPtZvD871QKjy74Wj1WSKFILMPRPSdUSx5RFK1arlJzEtA4PkFgnbuA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/picomatch": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.1.tgz",
@@ -943,6 +984,18 @@
         "queue-microtask": "^1.2.2"
       }
     },
+    "node_modules/semver": {
+      "version": "7.6.3",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.6.3.tgz",
+      "integrity": "sha512-oVekP1cKtI+CTDvHWYFUcMtsK/00wmAEfyqKfNdARm8u1wNVhSgaX7A8d4UuIlUI5e84iEwOhs7ZPYRmzU9U6A==",
+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/slash": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-3.0.0.tgz",
@@ -953,6 +1006,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/source-map-generator": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/source-map-generator/-/source-map-generator-0.8.0.tgz",
+      "integrity": "sha512-psgxdGMwl5MZM9S3FWee4EgsEaIjahYV5AzGnwUvPhWeITz/j6rKpysQHlQ4USdxvINlb8lKfWGIXwfkrgtqkA==",
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">= 10"
+      }
+    },
     "node_modules/to-regex-range": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
diff --git a/package.json b/package.json
index 1cc13f7..8e00603 100644
--- a/package.json
+++ b/package.json
@@ -4,8 +4,9 @@
   "description": "The utility which scans Obsidian Tasks and triggers proper notification about them",
   "main": "index.ts",
   "scripts": {
-    "start": "tsx src/index.ts",
-    "build": "tsc && tsc-alias"
+    "grammar": "peggy grammar/task.pegjs --dts -o src/generated/grammar/task.js",
+    "start": "npm run grammar && tsx src/index.ts",
+    "build": "npm run grammar && tsc && tsc-alias"
   },
   "author": "Bartłomiej Pluta <noreply.git@mx.bartlomiejpluta.com>",
   "license": "ISC",
@@ -19,5 +20,6 @@
     "typescript": "^5.6.3"
   },
   "dependencies": {
+    "peggy": "^4.2.0"
   }
 }
diff --git a/package.nix b/package.nix
index 33a359f..7bdfdd4 100644
--- a/package.nix
+++ b/package.nix
@@ -1,7 +1,11 @@
-{buildNpmPackage, ...}:
+{
+  buildNpmPackage,
+  lib,
+  ...
+}:
 buildNpmPackage {
   pname = "obsidian-tasks-reminder";
   version = "0.0.1";
   src = ./.;
-  npmDepsHash = "sha256-aUNhG2ntgUC14fQyad01nMoV2EY4gg3e6UvPOEhd8vU=";
+  npmDepsHash = "sha256-rhwGWuw/X7YGdPwIrgkIGukFNpAwpx/a6H3D/2cVP5Y=";
 }
diff --git a/src/index.ts b/src/index.ts
index 06f320c..e36cd8a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1 +1,3 @@
-console.log("Hello, world!");
\ No newline at end of file
+import {parse} from "./generated/grammar/task";
+
+console.log(parse("aabbabab"));
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
index d390236..6124404 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,6 +4,7 @@
     "module": "commonjs",
     "outDir": "./dist",
     "rootDir": "./src",
+    "allowJs": true,
     "strict": true,
     "esModuleInterop": true,
     "typeRoots": [
@@ -14,7 +15,7 @@
       "@types": ["./src/types"]
     }
   },
-  "include": ["src/**/*"],
+  "include": ["src/**/*"],  
   "exclude": [
     "node_modules",
     "src/types"