diff --git a/archiveteam_project_url_extractor.py b/archiveteam_project_url_extractor.py
index 886a480..38445fd 100644
--- a/archiveteam_project_url_extractor.py
+++ b/archiveteam_project_url_extractor.py
@@ -2,6 +2,7 @@ import subprocess
 import os
 from concurrent.futures import ThreadPoolExecutor
 from threading import Lock
+import re
 
 # Function to process each file
 def process_file(file, directory_path, output_directory, patterns, counter_lock, processed_counter):
@@ -19,20 +20,30 @@ def process_file(file, directory_path, output_directory, patterns, counter_lock,
         print(f"Skipping {file_path}. Unsupported file extension.")
         return
 
-    # Iterate through each pattern and process the file accordingly
-    for pattern, output_filename in patterns.items():
-        grep_command = f"grep -E '{pattern}'"
-        full_command = f"{command} | {grep_command}"
+    # Load the entire file content into memory
+    try:
+        file_content = subprocess.check_output(command, shell=True, text=True)
+    except subprocess.CalledProcessError as e:
+        print(f"Error processing {file_path}: {e}")
+        return
 
-        # Open the output file in append mode
+    # Create output files if they don't exist and prepare for appending matches
+    output_files = {}
+    for output_filename in patterns.values():
         output_file_path = os.path.join(output_directory, output_filename)
         if not os.path.exists(output_file_path):
             open(output_file_path, 'a').close()  # Create the file if it doesn't exist
+        output_files[output_filename] = open(output_file_path, "a")
 
-        with subprocess.Popen(full_command, shell=True, stdout=subprocess.PIPE, text=True) as proc:
-            with open(output_file_path, "a") as output_file:
-                for line in proc.stdout:
-                    output_file.write(line)
+    # Process the file content and apply all patterns
+    for line in file_content.splitlines():
+        for pattern, output_filename in patterns.items():
+            if re.search(pattern, line):
+                output_files[output_filename].write(line + '\n')
+    
+    # Close all output files
+    for output_file in output_files.values():
+        output_file.close()
 
     # Update the processed files count outside the inner loop
     with counter_lock:
@@ -99,4 +110,4 @@ with ThreadPoolExecutor(max_workers=num_concurrent_instances) as executor:
 # Check file size for any remaining files
 check_file_size(output_directory)
 
-print(f"\nAll files processed. URLs appended to corresponding output files.")
\ No newline at end of file
+print(f"\nAll files processed. URLs appended to corresponding output files.")