diff --git a/app/templates/v2_generate_patches.html b/app/templates/v2_generate_patches.html
index 237e15f..c2efcd9 100644
--- a/app/templates/v2_generate_patches.html
+++ b/app/templates/v2_generate_patches.html
@@ -23,11 +23,17 @@ <h1>Generate patches for file {{ file.filename|basename }}</h1>
             </div>
         </div>
         <div class="form-group row">
-            <label for="fist_line" class="col-sm-2 col-form-label">last line</label>
+            <label for="last_line" class="col-sm-2 col-form-label">last line</label>
             <div class="col-sm-10">
                 <input name="last_line" type="number" class="form-control" id="last_line" placeholder="last line">
             </div>
         </div>
+        <div class="form-group row">
+            <label for="ignore_regex" class="col-sm-2 col-form-label">Ignore lines matching regex</label>
+            <div class="col-sm-10">
+                <input name="ignore_regex" type="text" class="form-control" id="ignore_regex" placeholder="^std::cout.*$|^std::cerr.*$">
+            </div>
+        </div>
         {% for mutator_name, mutator in mutators.items() %}
             <div class="form-check">
                 <label class="form-check-label">
diff --git a/app/utils/Executor.py b/app/utils/Executor.py
index 508ad55..5637800 100644
--- a/app/utils/Executor.py
+++ b/app/utils/Executor.py
@@ -86,7 +86,7 @@ def workflow(self, patch: Patch):
             patchfile.close()
 
             # step 2: apply patch
-            self.__execute_command_timeout('patch -p1 --input={patchfile} {inputfile}'.format(patchfile=patchfile.name, inputfile=file.filename), cwd='/')
+            self.__execute_command_timeout('patch --ignore-whitespace -p1 --input={patchfile} {inputfile}'.format(patchfile=patchfile.name, inputfile=file.filename), cwd='/')
 
             # step 3: command pipeline
             success = self.__apply_command(patch, 'build_command') and \
@@ -100,7 +100,7 @@ def workflow(self, patch: Patch):
                  db.session.commit()
 
             # step 4: revert patch
-            self.__execute_command_timeout('patch -p1 --reverse --input={patchfile} {inputfile}'.format(patchfile=patchfile.name, inputfile=file.filename),
+            self.__execute_command_timeout('patch --ignore-whitespace -p1 --reverse --input={patchfile} {inputfile}'.format(patchfile=patchfile.name, inputfile=file.filename),
                                        cwd='/')
 
             # step 6: delete patch file
diff --git a/app/utils/SourceFile.py b/app/utils/SourceFile.py
index 917ee4e..2e0023d 100644
--- a/app/utils/SourceFile.py
+++ b/app/utils/SourceFile.py
@@ -2,6 +2,7 @@
 
 from app import db
 import os
+import re
 from datetime import datetime
 from app.utils.Mutation import get_mutators
 from app.utils.Replacement import Replacement
@@ -9,7 +10,7 @@
 
 
 class SourceFile:
-    def __init__(self, file: File, first_line, last_line):
+    def __init__(self, file: File, first_line, last_line, ignore_regex):
         self.file = file
         self.filename = file.filename
         self.full_content = [x.rstrip() for x in file.content.split('\n')]
@@ -18,6 +19,7 @@ def __init__(self, file: File, first_line, last_line):
         # self.full_content, we need to subtract -1
         self.first_line = first_line
         self.last_line = last_line
+        self.ignore_regex = ignore_regex
 
         if self.last_line == -1:
             self.last_line = len(self.full_content)
@@ -83,6 +85,9 @@ def __get_lines(self):
             if line_stripped.endswith('*/'):
                 in_comment = False
                 continue
+            
+            if re.fullmatch(self.ignore_regex, line_stripped):
+                continue
 
             # return line to mutate
             if not in_comment:
diff --git a/app/views.py b/app/views.py
index be1135f..e6360db 100644
--- a/app/views.py
+++ b/app/views.py
@@ -310,7 +310,12 @@ def route_v2_project_project_id_files_file_id_generate(project_id, file_id):
         except ValueError:
             last_line = -1
 
-        s = SourceFile(file, first_line, last_line)
+        try:
+            ignore_regex = request.form.get('ignore_regex')
+        except ValueError:
+            ignore_regex = ""
+
+        s = SourceFile(file, first_line, last_line, ignore_regex)
         s.generate_patches()
         flash('Successfully created patches.', category='message')
         return redirect(url_for('route_v2_project_project_id', project_id=project.id))