diff --git a/scripts/ob.ts b/scripts/ob.ts
index 1cf7ee8..b9ef1d8 100644
--- a/scripts/ob.ts
+++ b/scripts/ob.ts
@@ -7,20 +7,7 @@ import { basename, dirname, join, extname } from "jsr:@std/path";
 import { move } from "jsr:@std/fs";
 import { extractYaml } from "jsr:@std/front-matter";
 import { contentType } from "jsr:@std/media-types";
-
-// async function write(text: string) {
-//   const encoder = new TextEncoder();
-//   const data = encoder.encode(text);
-
-//   // Write the data to stdout without a newline
-//   await Deno.stdout.write(data);
-// }
-
-function isULID(str: string) {
-  // ULID regex to validate the format
-  const ulidRegex = /^[0-9A-HJKMNP-TV-Z]{26}$/i;
-  return ulidRegex.test(str);
-}
+import { isULID, slugify } from "../src/utils.ts";
 
 const rename = new Command()
   .description("Renames a note with a ULID")
diff --git a/src/pages/[...slug].astro b/src/pages/[...slug].astro
index ee61902..db84e14 100644
--- a/src/pages/[...slug].astro
+++ b/src/pages/[...slug].astro
@@ -1,4 +1,6 @@
 ---
+import { isULID } from "../utils.ts";
+
 export const prerender = false;
 
 /** 1 month in seconds */
@@ -10,12 +12,6 @@ const CACHE_TTL = 60 * 60 * 24 * 30;
 // simpler for now.
 const HOME_SLUG = "01J4CPMJ91NF1DNQPE3TZ50HH0";
 
-const ulidRegex = /^[0-9A-HJ-NP-TV-Z]{26}$/i;
-
-function isULID(ulid: string) {
-  return ulidRegex.test(ulid);
-}
-
 /**
  * If a `get` KV request returns null and it was requested with a cacheTTL,
  * the empty result will be cached. That's usually not what we want, so this
diff --git a/src/utils.ts b/src/utils.ts
index 8fcf2dd..2beafea 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -6,3 +6,5 @@ export const slugify = (s: string) =>
 
 export const isValidSha256 = (hashString: string) =>
   /^[a-fA-F0-9]{64}$/.test(hashString);
+
+export const isULID = (str: string) => /^[0-9A-HJKMNP-TV-Z]{26}$/i.test(str);