Fixes #19

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@bitcoinerlab/descriptors",
   "homepage": "https://github.com/bitcoinerlab/descriptors",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "description": "This library parses and creates Bitcoin Miniscript Descriptors and generates Partially Signed Bitcoin Transactions (PSBTs). It provides PSBT finalizers and signers for single-signature, BIP32 and Hardware Wallets.",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/miniscript.ts

@@ -104,8 +104,8 @@ function substituteAsm({
     //enclosed in <>, since <> represents hex code already encoded.
     //The regex below will match one or more digits within a string,
     //except if the sequence is surrounded by "<" and ">"
-    .replace(/(?<![<])\b\d+\b(?![>])/g, (num: string) =>
-      numberEncodeAsm(Number(num))
+    .replace(/(<\d+>)|\b\d+\b/g, match =>
+      match.startsWith('<') ? match : numberEncodeAsm(Number(match))
     )
     //we don't have numbers anymore, now it's safe to remove < and > since we
     //know that every remaining is either an op_code or a hex encoded number