Swift正则表达式适配问题：多平台函数文件特定函数集筛选求助

Hey there! Let's break down how to build the right regex for your function filtering task. I’ve dealt with similar multi-platform code cleanup before, so here’s a practical, step-by-step approach:

Before writing regex, you need to clearly define what makes your target functions distinct from the duplicates/alternatives. Ask yourself:

• Do they follow a specific naming pattern? (e.g., all start with core_, end with _base, or lack platform-specific suffixes like _win32/_mac)
• Do they have consistent return types or parameter structures?
• Are they defined in a specific syntax (C/C++, Python, etc.)?

For example, if your target functions are C-style and named like core_render()/core_update(), while duplicates are core_render_win32()/core_update_mac(), that’s your key pattern to leverage.

Let’s cover common scenarios:

Case 1: C/C++/C# Function Definitions #

If you want to match only target functions without platform suffixes, use this regex:

^(\w+)\s+(core_\w+)(?!_\w{2,4})\s*\([^)]*\)\s*\{?$

Breakdown: #

• ^: Anchors the match to the start of the line (avoids matching function calls mid-line)
• (\w+): Captures the return type (e.g., void, int, float)
• (core_\w+): Matches your target function name (adjust the prefix to match your actual pattern)
• (?!_\w{2,4}): Negative lookahead to exclude functions with platform suffixes (e.g., _win32, _macos)
• \s*\([^)]*\): Matches the parameter list (ignores whatever’s inside the parentheses)
• \s*\{?$: Accounts for optional opening braces if the function definition ends with {

Case 2: Python Function Definitions #

For Python functions where you want to exclude platform-specific variants, try:

^def\s+(\w+)(?!_\w+)\s*\([^)]*\):$

Breakdown: #

• ^def: Matches the start of a Python function definition
• (\w+): Captures the target function name
• (?!_\w+): Excludes functions with any suffix (adjust to (?!_win|_mac) for specific platforms)
• \s*\([^)]*\):: Matches the parameter list and closing colon

Pro tip: Use your code editor’s built-in regex search (like VS Code’s Find/Replace with regex mode) to test against your file. Try these checks:

1. Does it match all your target functions?
2. Does it correctly skip the duplicate/platform-specific functions?
3. Adjust the regex if your functions have edge cases (e.g., hyphens in names, default parameters, multi-line definitions).

For multi-line function definitions (common in Python or formatted C code), you might need to enable "dot matches newline" mode (usually a flag like s in regex engines) to cover lines spanning multiple lines.

Once your regex is solid, you can use it to extract target functions:

• In VS Code: Use "Find All" to select all matches, then copy them to a new file.
• In command line (with grep):

  grep -E '^(\w+)\s+(core_\w+)(?!_\w{2,4})\s*\([^)]*\)' your_code_file.c
  

内容的提问来源于stack exchange，提问作者Sal Aldana