diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..b943dbc
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "deno.enable": true
+}
\ No newline at end of file
diff --git a/example.ts b/example.ts
new file mode 100755
index 0000000..7c42052
--- /dev/null
+++ b/example.ts
@@ -0,0 +1,38 @@
+#!/bin/env -S deno run
+
+import { extr } from "./mod.ts"
+
+const date = ["month", " ", "day", " ", "h", ":", "m", ":", "s"] as const;
+const service = extr("", ...date, " ", "device", " ", "service", "[", "pid", "]: ", "line");
+const kernel_ = extr("", ...date, " ", "device", " kernel: ", "line");
+
+const lines = [
+    "août 06 09:25:18 navis systemd[1]: Finished Load Kernel Module configfs.",
+    "août 06 09:25:18 navis systemd[1]: modprobe@drm.service: Succeeded.",
+    "août 06 09:25:18 navis systemd[1]: Finished Load Kernel Module drm.",
+    "août 06 09:25:18 navis systemd[1]: Mounting Kernel Configuration File System...",
+    "août 06 09:25:18 navis kernel: fuse: init (API version 7.32)",
+    "août 06 09:25:18 navis systemd[1]: modprobe@fuse.service: Succeeded.",
+    "août 06 09:25:18 navis systemd[1]: Finished Load Kernel Module fuse.",
+    "août 06 09:25:18 navis systemd[1]: Mounted Kernel Configuration File System.",
+    "août 06 09:25:18 navis systemd[1]: Mounting FUSE Control File System...",
+    "août 06 09:25:18 navis systemd[1]: Mounted FUSE Control File System.",
+    "août 06 09:25:18 navis kernel: EXT4-fs (sda4): re-mounted. Opts: errors=remount-ro",
+    "août 06 09:25:18 navis systemd[1]: Finished Remount Root and Kernel File Systems.",
+    "août 06 09:25:18 navis systemd[1]: Condition check resulted in Rebuild Hardware Database being skipped.",
+    "août 06 09:25:18 navis systemd[1]: Condition check resulted in Platform Persistent Storage Archival being skipped.",
+    "août 06 09:25:18 navis systemd[1]: Starting Load/Save Random Seed...",
+    "août 06 09:25:18 navis systemd[1]: Starting Create System Users...",
+    "août 06 09:25:18 navis kernel: lp: driver loaded but no devices found",
+    "août 06 09:25:18 navis kernel: ppdev: user-space parallel port driver",
+    "août 06 09:25:18 navis systemd[1]: Finished Load/Save Random Seed.",
+    "août 06 09:25:18 navis systemd[1]: Finished Load Kernel Modules.",
+    "août 06 09:25:18 navis systemd[1]: Condition check resulted in First Boot Complete being skipped.",
+    "août 06 09:25:18 navis systemd[1]: Starting Apply Kernel Variables...",
+    "août 06 09:25:18 navis systemd[1]: Finished Create System Users.",
+];
+const mapped = lines.map(line => service.or(kernel_).get(line));
+const failed = mapped.filter(m => m === null).length;
+const content = mapped.filter(m => m !== null).map(m => "service" in m! ? [m.service, m.line] : ["kernel", m!.line]);
+
+console.log({ failed, content })
diff --git a/lib/rule.ts b/lib/rule.ts
index b18da3c..3f950a7 100644
--- a/lib/rule.ts
+++ b/lib/rule.ts
@@ -17,18 +17,26 @@ export class Rule<V extends string[]> {
             if (text.length > 0) return null;
             else return {} as StructOfArr<V, string>;
         }
-        if (!text.includes(first_sep.word)) return null;
-        let [val, rest] = text.split(first_sep.word, 2);
+        let [val, rest] = split_once(text, first_sep.word);
+        if (rest === null) return null;
         const result = {} as Record<string, string>;
         for (const [key, sep] of zip(this.vars, this.separators.slice(1))) {
             if (sep.kind === "end") {
                 result[key] = rest;
                 break;
             }
-            if (!rest.includes(sep.word)) return null;
-            [val, rest] = rest.split(sep.word, 2);
+            [val, rest] = split_once(rest, sep.word);
+            if (rest === null) return null;
             result[key] = val;
         }
         return result as StructOfArr<V, string>;
     }
 }
+
+function split_once(text: string, separator: string) {
+    const cursor = text.indexOf(separator);
+    if (cursor === -1) return [text, null] as const;
+    const left = text.slice(0, cursor);
+    const right = text.slice(cursor + separator.length);
+    return [left, right] as const;
+}
diff --git a/mod.ts b/mod.ts
index eff9d90..b7107de 100644
--- a/mod.ts
+++ b/mod.ts
@@ -1 +1 @@
-import { extr } from "./lib/lib.ts"
+export { extr } from "./lib/lib.ts"