diff --git a/code/07/regex-quiz.py b/code/07/regex-quiz.py
new file mode 100644
index 0000000..7424ff3
--- /dev/null
+++ b/code/07/regex-quiz.py
@@ -0,0 +1,51 @@
+import re
+import unittest
+
+FLAGS = re.X | re.S
+REGEXP = r"""
+(?P<date>\d{4}(-\d{2}){2})  # date format like: YYYY-MM-DD
+    \s
+(?P<time>\d{2}(:\d{2}){2})  # time format like: HH:MM:SS
+    [\s-]+
+(?P<project>[^\s-]+)        # project name
+    [\s-]+
+(?P<filename>.*)            # filename
+"""
+pat = re.compile(REGEXP, FLAGS)
+
+files = """
+2021-10-10 20:20:20-其他 - 数据.csv
+2021-10-21 12:23:41-写作 - 少数派稿子.md
+2020-01-13 13:45:15-测试 - 测试案例.py
+2019-08-09 10:21:39-日记 -20190809 日记.md
+2017-12-12 12:12:12-工作 - 公司合同.docx
+"""
+files = files.strip().split("\n")
+
+
+def rename(file):
+    matched = pat.search(file).groupdict()
+    date = matched["date"].replace("-", "")
+    project = matched["project"].replace(" ", "_")
+    filename = matched["filename"].replace(" ", "_")
+    return "_".join([date, project, filename])
+
+
+class TestRename(unittest.TestCase):
+
+    cases = [
+        ("2021-10-10 20:20:20-其他 - 数据.csv", "20211010_其他_数据.csv"),
+        ("2021-10-21 12:23:41-写作 - 少数派稿子.md", "20211021_写作_少数派稿子.md"),
+        ("2020-01-13 13:45:15-测试 - 测试案例.py", "20200113_测试_测试案例.py"),
+        ("2019-08-09 10:21:39-日记 -20190809 日记.md", "20190809_日记_20190809_日记.md"),
+        ("2017-12-12 12:12:12-工作 - 公司合同.docx", "20171212_工作_公司合同.docx"),
+    ]
+
+    def test_rename(self):
+        for (raw, expected) in self.cases:
+            file = rename(raw)
+            self.assertEquals(file, expected)
+
+
+if __name__ == '__main__':
+    unittest.main()