diff --git a/Dockerfile b/Dockerfile
index 0cae3bf..64fba83 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.7-alpine
+FROM ruby:3-alpine3.13
 
 LABEL "com.github.actions.name"="Comment on PR"
 LABEL "com.github.actions.description"="Leaves a comment on an open PR matching a push event."
diff --git a/README.md b/README.md
index b0496fc..985ec0d 100644
--- a/README.md
+++ b/README.md
@@ -24,5 +24,6 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           msg: "Check out this message!"
-          check_for_duplicate_msg: false  # OPTIONAL 
+          check_for_duplicate_msg: false  # OPTIONAL
+          delete_prev_regex_msg: "[0-9]"  # OPTIONAL
 ```
diff --git a/action.yml b/action.yml
index 19c0218..c8a21cc 100644
--- a/action.yml
+++ b/action.yml
@@ -9,12 +9,23 @@ inputs:
     description: Comment's message
     required: true
   check_for_duplicate_msg:
-    description: If false, action doesn't check for duplicate msg.
+    description: If false, action doesn't check for duplicate message.
     required: false
     default: true
+  delete_prev_regex_msg:
+    description: If not empty, all messages matching the given regex will be deleted.
+    required: false
+    default: nil
+  duplicate_msg_pattern:
+    description: Optional pattern to use when checking for duplicate message.
+    required: false
+
 runs:
   using: 'docker'
   image: 'Dockerfile'
   args:
     - ${{ inputs.msg }}
     - ${{ inputs.check_for_duplicate_msg }}
+    - ${{ inputs.delete_prev_regex_msg }}
+    - ${{ inputs.duplicate_msg_pattern }}
+
diff --git a/entrypoint.sh b/entrypoint.sh
index 9dc8dd2..b3f000e 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -20,6 +20,9 @@ end
 
 message = ARGV[0]
 check_duplicate_msg = ARGV[1]
+delete_prev_regex_msg = ARGV[2]
+duplicate_msg_pattern = ARGV[3]
+
 repo = event["repository"]["full_name"]
 
 if ENV.fetch("GITHUB_EVENT_NAME") == "pull_request"
@@ -39,7 +42,13 @@ end
 
 if check_duplicate_msg == "true"
   coms = github.issue_comments(repo, pr_number)
-  duplicate = coms.find { |c| c["body"] == message }
+
+  duplicate = if duplicate_msg_pattern
+    coms.find { |c| (c["body"] =~ Regexp.new duplicate_msg_pattern) }
+  else
+    coms.find { |c| c["body"] == message }
+  end
+
 
   if duplicate
     puts "The PR already contains this message"
@@ -47,4 +56,12 @@ if check_duplicate_msg == "true"
   end
 end
 
+ if delete_prev_regex_msg != nil
+  coms.each do |n|
+    if n["body"].match(/#{delete_prev_regex_msg}/)
+	github.delete_comment(repo, n["id"], opt = {})
+    end
+  end
+end
+
 github.add_comment(repo, pr_number, message)