diff --git a/app/log.txt b/app/log.txt
new file mode 100644
index 0000000..d2e9968
--- /dev/null
+++ b/app/log.txt
@@ -0,0 +1 @@
+this is some test [Animaslsd] sdtri
\ No newline at end of file
diff --git a/app/test_num.py b/app/test_num.py
new file mode 100644
index 0000000..7e75d0c
--- /dev/null
+++ b/app/test_num.py
@@ -0,0 +1,3 @@
+b = 5
+a = 2
+assert b < a
\ No newline at end of file
diff --git a/app/test_regex.py b/app/test_regex.py
new file mode 100644
index 0000000..01ae111
--- /dev/null
+++ b/app/test_regex.py
@@ -0,0 +1,33 @@
+"""
+Content of "log.txt":
+10.1.2.1 - car [01/Mar/2022:13:05:05 +0900] "GET /python HTTP/1.0" 200 2222
+10.1.1.9 - bike [01/Mar/2022:13:05:10 +0900] "GET /python HTTP/1.0" 200 2222
+
+Expected output:
+01/Mar/2022:13:05:05 +0900
+01/Mar/2022:13:05:10 +0900
+"""
+import re
+
+def parse1():
+    for line in open("log.txt"):
+        print(line.split("[")[1].split("]")[0])
+        assert True
+
+def parse2():
+    for line in open("log.txt", "r"):
+        print(line.split()[3].strip("[]"))
+        assert False
+
+def parse3():
+    for line in open("log.txt", "r"):
+        print(" ".join(line.split("[" or "]")[3:5]))
+        assert True
+
+print('Hello World')
+parse3()
+
+
+if __name__ == "__main__":
+    parse1()
+    parse3()