From 1e73b5f5044fa778196ca21dc08ed14738764935 Mon Sep 17 00:00:00 2001
From: 2509165003 <2509165003@student.edu.cn>
Date: Thu, 2 Apr 2026 16:01:37 +0800
Subject: [PATCH] 4.2

---
 4.2作业.py  | 15 +++++++++++++++
 4.2作业2.py |  0
 2 files changed, 15 insertions(+)
 create mode 100644 4.2作业.py
 create mode 100644 4.2作业2.py

diff --git a/4.2作业.py b/4.2作业.py
new file mode 100644
index 0000000..a7f989a
--- /dev/null
+++ b/4.2作业.py
@@ -0,0 +1,15 @@
+import re
+
+phone_book = '''
+张三：138-1999-9101
+李四：139-1998-5678
+王五：138-1997-1234
+'''
+
+pattern = r'(\d{3})-(\d{4})-(\d{4})'
+
+def mask_phone(match):
+    return f'{match.group(1)}-****-{match.group(3)}'
+
+masked = re.sub(pattern, mask_phone, phone_book)
+print(masked)
\ No newline at end of file
diff --git a/4.2作业2.py b/4.2作业2.py
new file mode 100644
index 0000000..e69de29