diff --git a/.github/badges/typescript/2023.json b/.github/badges/typescript/2023.json
index 0c72321dc..63e376822 100644
--- a/.github/badges/typescript/2023.json
+++ b/.github/badges/typescript/2023.json
@@ -1,6 +1,6 @@
 {
 	"schemaVersion": 1,
 	"label": "Advent of TypeScript 2023",
-	"message": "11/25",
+	"message": "12/25",
 	"color": "orange"
 }
diff --git a/solutions/typescript/2023/12/src/p1.ts b/solutions/typescript/2023/12/src/p1.ts
index 1a5303e35..c25f18297 100644
--- a/solutions/typescript/2023/12/src/p1.ts
+++ b/solutions/typescript/2023/12/src/p1.ts
@@ -1,17 +1,22 @@
-import { cartesianCombinations, task } from '@alexaegis/advent-of-code-lib';
+import { task } from '@alexaegis/advent-of-code-lib';
 import packageJson from '../package.json';
-import { parse } from './parse.js';
-
-function generateVariations(damagedLog: string, criteria: RegExp): string[] {
-	const variants = [...damagedLog].map((entry) => (entry === '?' ? ['#', '.'] : [entry]));
-	return cartesianCombinations(...variants)
-		.map((combination) => combination.join(''))
-		.filter((combination) => criteria.test(combination));
-}
+import { calculateVariations, parse } from './parse.js';
 
 export const p1 = (input: string): number =>
 	parse(input)
-		.map((spring) => generateVariations(spring.log, spring.criteriaRegExp).length)
+		.map((entry) => {
+			const [currentCriteria, ...remainingCriteria] = entry.criteria;
+			if (!currentCriteria) {
+				throw new Error('no criteria for line');
+			}
+			return calculateVariations({
+				currentCriteria,
+				currentOriginalCriteria: currentCriteria,
+				rebuiltLog: '',
+				remainingCriteria,
+				remainingDamagedLog: entry.log,
+			});
+		})
 		.sum();
 
-await task(p1, packageJson.aoc); // 7118 ~0ms
+await task(p1, packageJson.aoc); // 7118 ~30.83ms
diff --git a/solutions/typescript/2023/12/src/p2.ts b/solutions/typescript/2023/12/src/p2.ts
index 730bca95f..48a0b01d4 100644
--- a/solutions/typescript/2023/12/src/p2.ts
+++ b/solutions/typescript/2023/12/src/p2.ts
@@ -1,120 +1,6 @@
 import { task } from '@alexaegis/advent-of-code-lib';
 import packageJson from '../package.json';
-import { parse, type SpringLog } from './parse.js';
-
-interface State {
-	rebuiltLog: string;
-	currentCriteria: number;
-	currentOriginalCriteria: number;
-	remainingDamagedLog: string;
-	remainingCriteria: number[];
-}
-
-const calculateVariations = (state: State, cache: Map<string, number>): number => {
-	const key =
-		state.remainingCriteria.join(',') +
-		';' +
-		state.remainingDamagedLog +
-		';' +
-		state.currentOriginalCriteria +
-		';' +
-		state.currentCriteria;
-
-	const cachedResult = cache.get(key);
-	if (cachedResult !== undefined) {
-		return cachedResult;
-	}
-
-	let result = cachedResult ?? 0;
-
-	while (state.currentCriteria > 0 && state.remainingDamagedLog.startsWith('#')) {
-		state.currentCriteria = state.currentCriteria - 1;
-		state.remainingDamagedLog = state.remainingDamagedLog.slice(1);
-		state.rebuiltLog = state.rebuiltLog + '#';
-	}
-
-	if (
-		state.currentCriteria === 0 &&
-		state.remainingCriteria.length === 0 &&
-		!state.remainingDamagedLog.includes('#')
-	) {
-		state.rebuiltLog += state.remainingDamagedLog.replaceAll('?', '.');
-		return 1;
-	}
-
-	while (
-		state.currentCriteria === state.currentOriginalCriteria &&
-		state.remainingDamagedLog.startsWith('.')
-	) {
-		state.remainingDamagedLog = state.remainingDamagedLog.slice(1);
-		state.rebuiltLog = state.rebuiltLog + '.';
-	}
-
-	if (state.currentCriteria > 0 && state.remainingDamagedLog.startsWith('.')) {
-		return 0;
-	}
-
-	if (state.currentCriteria === 0 && state.remainingDamagedLog.startsWith('#')) {
-		return 0;
-	}
-
-	if (
-		state.currentCriteria === 0 &&
-		(state.remainingDamagedLog.startsWith('.') || state.remainingDamagedLog.startsWith('?'))
-	) {
-		const nextCriteria = state.remainingCriteria.shift();
-
-		if (nextCriteria === undefined) {
-			state.currentOriginalCriteria = 0;
-		} else {
-			state.currentCriteria = nextCriteria;
-			state.currentOriginalCriteria = nextCriteria;
-		}
-
-		state.rebuiltLog = state.rebuiltLog + '.';
-		state.remainingDamagedLog = state.remainingDamagedLog.slice(1);
-	}
-
-	while (
-		state.currentCriteria === state.currentOriginalCriteria &&
-		state.remainingDamagedLog.startsWith('.')
-	) {
-		state.remainingDamagedLog = state.remainingDamagedLog.slice(1);
-		state.rebuiltLog = state.rebuiltLog + '.';
-	}
-
-	if (
-		state.currentCriteria === 0 &&
-		state.remainingDamagedLog.length === 0 &&
-		state.remainingCriteria.length === 0
-	) {
-		return 1;
-	}
-
-	if (state.remainingDamagedLog.startsWith('?')) {
-		result += calculateVariations(
-			{
-				...state,
-				remainingCriteria: [...state.remainingCriteria],
-				remainingDamagedLog: '#' + state.remainingDamagedLog.slice(1),
-			},
-			cache,
-		);
-
-		result += calculateVariations(
-			{
-				...state,
-				remainingCriteria: [...state.remainingCriteria],
-				remainingDamagedLog: '.' + state.remainingDamagedLog.slice(1),
-			},
-			cache,
-		);
-	} else if (state.currentCriteria > 0 && state.remainingDamagedLog.length > 0) {
-		result += calculateVariations(state, cache);
-	}
-	cache.set(key, result);
-	return result;
-};
+import { calculateVariations, parse, type SpringLog } from './parse.js';
 
 const unfoldEntry =
 	(times: number) =>
@@ -134,17 +20,14 @@ export const p2 = (input: string): number =>
 			if (!currentCriteria) {
 				throw new Error('no criteria for line');
 			}
-			return calculateVariations(
-				{
-					currentCriteria,
-					currentOriginalCriteria: currentCriteria,
-					rebuiltLog: '',
-					remainingCriteria,
-					remainingDamagedLog: entry.log,
-				},
-				new Map(),
-			);
+			return calculateVariations({
+				currentCriteria,
+				currentOriginalCriteria: currentCriteria,
+				rebuiltLog: '',
+				remainingCriteria,
+				remainingDamagedLog: entry.log,
+			});
 		})
 		.sum();
 
-await task(p2, packageJson.aoc); // 7030194981795 ~0ms
+await task(p2, packageJson.aoc); // 7030194981795 ~539.06ms
diff --git a/solutions/typescript/2023/12/src/parse.ts b/solutions/typescript/2023/12/src/parse.ts
index 221557c5e..fa8f13208 100644
--- a/solutions/typescript/2023/12/src/parse.ts
+++ b/solutions/typescript/2023/12/src/parse.ts
@@ -1,25 +1,132 @@
 export interface SpringLog {
-	/**
-	 * `?` unknown
-	 * `.` operational
-	 * `#` damaged
-	 */
 	log: string;
 	criteria: number[];
-	criteriaRegExp: RegExp;
 }
 
-export const criteriaToRegExp = (criteria: number[]): RegExp =>
-	new RegExp('^\\.*' + criteria.map((brokenCount) => `#{${brokenCount}}`).join('\\.+') + '\\.*$');
-
 export const parse = (input: string): SpringLog[] => {
 	return input.lines(false).map<SpringLog>((line) => {
 		const [log, critRaw] = line.splitIntoStringPair(' ');
-		const crit = critRaw.splitToInt({ delimiter: /,/ });
+		const criteria = critRaw.splitToInt({ delimiter: /,/ });
 		return {
 			log,
-			criteria: crit,
-			criteriaRegExp: criteriaToRegExp(crit),
+			criteria,
 		};
 	});
 };
+
+export interface State {
+	rebuiltLog: string;
+	currentCriteria: number;
+	currentOriginalCriteria: number;
+	remainingDamagedLog: string;
+	remainingCriteria: number[];
+}
+
+export const calculateVariations = (
+	state: State,
+	cache: Map<string, number> = new Map(),
+): number => {
+	const key =
+		state.remainingCriteria.join(',') +
+		';' +
+		state.remainingDamagedLog +
+		';' +
+		state.currentOriginalCriteria +
+		';' +
+		state.currentCriteria;
+
+	const cachedResult = cache.get(key);
+	if (cachedResult !== undefined) {
+		return cachedResult;
+	}
+
+	let result = cachedResult ?? 0;
+
+	while (state.currentCriteria > 0 && state.remainingDamagedLog.startsWith('#')) {
+		state.currentCriteria = state.currentCriteria - 1;
+		state.remainingDamagedLog = state.remainingDamagedLog.slice(1);
+		state.rebuiltLog = state.rebuiltLog + '#';
+	}
+
+	if (
+		state.currentCriteria === 0 &&
+		state.remainingCriteria.length === 0 &&
+		!state.remainingDamagedLog.includes('#')
+	) {
+		state.rebuiltLog += state.remainingDamagedLog.replaceAll('?', '.');
+		return 1;
+	}
+
+	while (
+		state.currentCriteria === state.currentOriginalCriteria &&
+		state.remainingDamagedLog.startsWith('.')
+	) {
+		state.remainingDamagedLog = state.remainingDamagedLog.slice(1);
+		state.rebuiltLog = state.rebuiltLog + '.';
+	}
+
+	if (state.currentCriteria > 0 && state.remainingDamagedLog.startsWith('.')) {
+		return 0;
+	}
+
+	if (state.currentCriteria === 0 && state.remainingDamagedLog.startsWith('#')) {
+		return 0;
+	}
+
+	if (
+		state.currentCriteria === 0 &&
+		(state.remainingDamagedLog.startsWith('.') || state.remainingDamagedLog.startsWith('?'))
+	) {
+		const nextCriteria = state.remainingCriteria.shift();
+
+		if (nextCriteria === undefined) {
+			state.currentOriginalCriteria = 0;
+		} else {
+			state.currentCriteria = nextCriteria;
+			state.currentOriginalCriteria = nextCriteria;
+		}
+
+		state.rebuiltLog = state.rebuiltLog + '.';
+		state.remainingDamagedLog = state.remainingDamagedLog.slice(1);
+	}
+
+	while (
+		state.currentCriteria === state.currentOriginalCriteria &&
+		state.remainingDamagedLog.startsWith('.')
+	) {
+		state.remainingDamagedLog = state.remainingDamagedLog.slice(1);
+		state.rebuiltLog = state.rebuiltLog + '.';
+	}
+
+	if (
+		state.currentCriteria === 0 &&
+		state.remainingDamagedLog.length === 0 &&
+		state.remainingCriteria.length === 0
+	) {
+		return 1;
+	}
+
+	if (state.remainingDamagedLog.startsWith('?')) {
+		result += calculateVariations(
+			{
+				...state,
+				remainingCriteria: [...state.remainingCriteria],
+				remainingDamagedLog: '#' + state.remainingDamagedLog.slice(1),
+			},
+			cache,
+		);
+
+		result += calculateVariations(
+			{
+				...state,
+				remainingCriteria: [...state.remainingCriteria],
+				remainingDamagedLog: '.' + state.remainingDamagedLog.slice(1),
+			},
+			cache,
+		);
+	} else if (state.currentCriteria > 0 && state.remainingDamagedLog.length > 0) {
+		result += calculateVariations(state, cache);
+	}
+	cache.set(key, result);
+	return result;
+};
diff --git a/solutions/typescript/readme.md b/solutions/typescript/readme.md
index 3a87968e8..8286e5ad7 100644
--- a/solutions/typescript/readme.md
+++ b/solutions/typescript/readme.md
@@ -19,7 +19,7 @@
 | [Day 9](/solutions/typescript/2023/09/)  | [1.57ms](/solutions/typescript/2023/09/src/p1.ts)   | [1.62ms](/solutions/typescript/2023/09/src/p2.ts)   |
 | [Day 10](/solutions/typescript/2023/10/) | [68.44ms](/solutions/typescript/2023/10/src/p1.ts)  | [1.4s](/solutions/typescript/2023/10/src/p2.ts)     |
 | [Day 11](/solutions/typescript/2023/11/) | [104.54ms](/solutions/typescript/2023/11/src/p1.ts) | [104.48ms](/solutions/typescript/2023/11/src/p2.ts) |
-| Day 12                                   | -                                                   | -                                                   |
+| [Day 12](/solutions/typescript/2023/12/) | [30.83ms](/solutions/typescript/2023/12/src/p1.ts)  | [539.06ms](/solutions/typescript/2023/12/src/p2.ts) |
 | Day 13                                   | -                                                   | -                                                   |
 | Day 14                                   | -                                                   | -                                                   |
 | Day 15                                   | -                                                   | -                                                   |