diff --git a/src/index.js b/src/index.js
index d0070ec..96885a4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -19,7 +19,7 @@ function getCardNumbers(message) {
   console.log(`getCardNumber(${message})`);
   console.log(`Trello ID match pattern ${trelloCardIdPattern}`)
   let ids = message && message.length > 0 ? message.replace(regexPullRequest, "").match(new RegExp(`${trelloCardIdPattern}\\d+`, 'g')) : [];
-  return ids && ids.length > 0 ? ids.map(x => x.replace(trelloCardIdPattern, '')) : null;
+  return ids && ids.length > 0 ? ids.map(x => x.replace(new RegExp(trelloCardIdPattern), '')) : null;
 }
 
 function getAllCardNumbers(message, branch) {
@@ -179,4 +179,4 @@ async function run() {
   }
 };
 
-run()
\ No newline at end of file
+run()