diff --git a/0/0.py b/00/0.py
similarity index 100%
rename from 0/0.py
rename to 00/0.py
diff --git a/1/cesar_shift.py b/01/cesar_shift.py
similarity index 100%
rename from 1/cesar_shift.py
rename to 01/cesar_shift.py
diff --git a/2/counter.py b/02/counter.py
similarity index 100%
rename from 2/counter.py
rename to 02/counter.py
diff --git a/2/string.txt b/02/string.txt
similarity index 100%
rename from 2/string.txt
rename to 02/string.txt
diff --git a/03/find_pattern.py b/03/find_pattern.py
index e4f0473..c321389 100644
--- a/03/find_pattern.py
+++ b/03/find_pattern.py
@@ -11,7 +11,7 @@ def find_pattern(pattern_string):
 
 
 def main():
-    pattern_string = r'[a-z][A-Z]{3}(?P<solution>[a-z]){1}[A-Z]{3}[a-z]'
+    pattern_string = r'[a-z][A-Z]{3}(?P<solution>[a-z]){01}[A-Z]{3}[a-z]'
     string = find_pattern(pattern_string)
     builder = Url()
     builder.slug = 'php'