Regex Not Capturing Complex Nested Parentheses in Python - Need guide with Multi-Level Structure
Hey everyone, I'm running into an issue that's driving me crazy... This might be a silly question, but Can someone help me understand I'm working on a regex to extract nested parentheses in a string, but I'm running into issues when the nesting gets more complex... For instance, I want to match strings like `((a + b) * (c - d))` and `((x))`, but I'm struggling to get a proper match for multi-level structures. I initially wrote this regex: ```python import re pattern = r'\(([^()]*|(?R))*\)' ``` I thought using recursion with `(?R)` would help, but it's not supported in Python's `re` module, which is likely causing the question. When I try to run this code: ```python test_string = '((a + b) * (c - d))' match = re.search(pattern, test_string) print(match.group()) ``` I get the behavior message: `re.behavior: unrecognized group name` because of the `(?R)` syntax. I also tried simplifying my regex to: ```python pattern = r'\(([^()]*)\)' ``` This only captures the outermost parentheses but fails to handle nested structures. I need a solution that can capture all nested parentheses correctly. Is there a way to achieve this in Python? Any tips or alternative approaches would be greatly appreciated! I'm using Python LTS in this project. I'm open to any suggestions. Any pointers in the right direction? I recently upgraded to Python LTS. Has anyone else encountered this?