Notepad++正则替换：仅替换Python注释内的单引号为双引号

Since you're using Notepad++ with PCRE regex, here's a reliable way to replace single quotes with double quotes only in Python comment sections (after #), while leaving code strings untouched:

Step 1: Open the Find/Replace Dialog #

Press Ctrl+H to bring up the Find/Replace window.

Step 2: Configure Regex Settings #

• Check the Regular expression radio button under "Search Mode".
• Ensure Match case is unchecked (you don’t need case sensitivity here).
• Check Wrap around to process your entire 800-line file.

Step 3: Enter the Regex Patterns #

• Find what:
  (?:(?<!\\)(['"])(?:\\.|(?!\1).)*\1|.)*?\K(?<=#)'
• Replace with:
  "

Step 4: Run the Replacement #

Click Replace All. This will replace all unescaped single quotes in comment sections with double quotes, leaving code strings (before #) completely untouched.

How This Works (For Curious Newbies) #

Let’s break down the regex to help you understand why it’s safe and effective:

• (?:(?<!\\)(['"])(?:\\.|(?!\1).)*\1|.)*?: Skips over all valid Python strings (both single and double quoted, including escaped characters) and regular code until it reaches the first # that’s not inside a string (the start of a real comment).
• \K: Resets the match, so we ignore everything before this point (your actual code).
• (?<=#): Ensures we only target characters immediately after a comment #.
• ': Matches the single quote we want to replace.

Edge Cases Handled #

• Ignores # characters inside string literals (so quotes in strings like print('# test') won’t be touched).
• Skips escaped single quotes in comments (e.g., # don\'t replace this remains unchanged).
• Works for trailing comments after code (the exact use case you described).

Example Result #

Original line:

list1 = ['apple','banana','pear'] # replace 'this' and 'that'

After replacement:

list1 = ['apple','banana','pear'] # replace "this" and "that"

内容的提问来源于stack exchange，提问作者TomH