Mastering Python Regex for Semi‑finished Product Codes

1. Introduction

Hello, I am PiPi. Recently a member of the Python community asked about a Python regular‑expression problem, which we solved together. The follow‑up question asks how to match strings such as “半成品（广州）1#”, “半成品（北京）1#”, “半成品（广州）2#”, and “半成品（北京）2#”.

2. Implementation

The solution provided uses a regex pattern that captures the city name (Beijing or Guangzhou) followed by a number and a hash sign: 半成品（(?:北京|广州)）\d+# This pattern works by using a non‑capturing group (?:北京|广州) to match either city, then \d+ to match one or more digits, and finally the literal #. The pattern correctly matches all the required examples.

3. Conclusion

The article demonstrates how to construct and apply a Python regular expression to solve a specific string‑matching problem, providing the exact pattern and explaining its logic so readers can adapt it to similar tasks.