Unable to Parse logs using filter{} in Logstash


I want to parse a log but I am not able to achieve this. I am getting no output on my console. Whenever I run logstash using the command:
bin/logstash -f firstInput.conf --debug

I get this:
Starting pipeline {:id=>"main", :pipeline_workers=>8, :batch_size=>125, :batch_delay=>5, :max_inflight=>1000, :level=>:info, :file=>"logstash/pipeline.rb", :line=>"188", :method=>"start_workers"}
Pipeline main started {:file=>"logstash/agent.rb", :line=>"465", :method=>"start_pipeline"}
each: file grew: /Users/mac/project/Logstash/logs/access_logs.logs: old size 0, new size 94 {:level=>:debug, :file=>"filewatch/watch.rb", :line=>"254", :method=>"each"}
each: file grew: /Users/mac/project/Logstash/logs/access_logs.logs: old size 0, new size 94 {:level=>:debug, :file=>"filewatch/watch.rb", :line=>"254", :method=>"each"}

and this keeps on repeating.

I had written a custom regex for parsing this log which is stated below. I also checked it with grok debugger and it gave me the correct output.
"%{TIMESTAMP:timestamp} %{IPORHOST:clientip} %{IPORHOST:clientip2} %{IPORHOST:serverip} %{URI_FRONT:uri}"

URI_FRONT [0-9a-zA-Z*/][0-9a-zA-Z].[a-z][a-z][a-z]
TIMESTAMP (?>\d\d){1,2}-(?:0[1-9]|1[0-2])-(?:(?:0[1-9])|(?:[12][0-9])|(?:3[01])|[1-9]) (?:2[0123]|[01]?[0-9]):(?:[0-5][0-9]):(?:(?:[0-5]?[0-9]|60)(?:[:.,][0-9]+)?)

The config that I am using is:

input {
file {
path => "/Users/macproject/Logstash/logs/access_logs.logs"
sincedb_path => "/dev/null"
start_position => beginning

   ignore_older => 0


filter {

grok {
	patterns_dir => ["/Users/mac/project/Logstash/patterns"]
	match => { "message" => "%{TIMESTAMP:timestamp}@~#%{IPORHOST:clientip}@~#%{IPORHOST:clientip2}@~#%{IPORHOST:serverip}@~#%{URI_FRONT:uri}" }


output {

stdout { 
	codec => rubydebug 


The custom formats that I have given are being read by logstash but I am not able to get anything on my console.

Could you please help me. I am trying hard but unable to do it.