diff --git a/.oxlintrc.json b/.oxlintrc.json
index 879b145..890c28c 100644
--- a/.oxlintrc.json
+++ b/.oxlintrc.json
@@ -5,6 +5,7 @@
 	"rules": {
 		"typescript/no-unnecessary-type-assertion": "error",
 		"typescript/no-deprecated": "warn",
+		"typescript/prefer-regexp-exec": "error",
 		"unicorn/prefer-string-replace-all": "error",
 		"unicorn/prefer-string-raw": "error",
 		"jest/expect-expect": [
diff --git a/apps/web/src/adapters/bestiary-adapter.ts b/apps/web/src/adapters/bestiary-adapter.ts
index e2fcfb7..e1be96a 100644
--- a/apps/web/src/adapters/bestiary-adapter.ts
+++ b/apps/web/src/adapters/bestiary-adapter.ts
@@ -170,7 +170,7 @@ function extractAc(ac: RawMonster["ac"]): {
 	}
 	if ("special" in first) {
 		// Variable AC (e.g. spell summons) — parse leading number if possible
-		const match = first.special.match(LEADING_DIGITS_REGEX);
+		const match = LEADING_DIGITS_REGEX.exec(first.special);
 		return {
 			value: match ? Number(match[1]) : 0,
 			source: first.special,
diff --git a/packages/domain/src/auto-number.ts b/packages/domain/src/auto-number.ts
index 2ee81ab..17c2c18 100644
--- a/packages/domain/src/auto-number.ts
+++ b/packages/domain/src/auto-number.ts
@@ -23,7 +23,9 @@ export function resolveCreatureName(
 		if (name === baseName) {
 			exactMatches.push(i);
 		} else {
-			const match = new RegExp(`^${escapeRegExp(baseName)} (\\d+)$`).exec(name);
+			const match = new RegExp(
+				String.raw`^${escapeRegExp(baseName)} (\d+)$`,
+			).exec(name);
 			// biome-ignore lint/nursery/noUnnecessaryConditions: RegExp.exec() returns null on no match — false positive
 			if (match) {
 				const num = Number.parseInt(match[1], 10);