如何在Emacs中按Unicode编号范围搜索并替换字符？

If you need to target characters in the Unicode range U+1D000 to U+1DFFF (which includes mathematical alphanumeric symbols and other supplementary plane characters) and wrap each match in double quotes, here's a step-by-step guide using Emacs' regex tools:

Step 1: Launch the Regex Replace Tool #

Open the buffer containing your text, then trigger the query-replace-regexp command—this lets you review each change before applying it (safer than a blind replace):

• Use the keyboard shortcut: C-M-% (hold Ctrl + Alt, then press %)
• Or type M-x query-replace-regexp (press Alt+x, then enter the command name and hit Enter)

Step 2: Enter the Unicode Range Regex Pattern #

When prompted for the "Regexp to replace:", input this pattern:

[\x{1d000}-\x{1dfff}]

• \x{XXXXXX} is Emacs' syntax for specifying a Unicode code point (here, 5-digit values for the supplementary plane range).
• The square brackets create a character class that matches any single character between U+1D000 and U+1DFFF inclusive.

Step 3: Define the Replacement String #

Next, when asked for the "Replacement string:", enter:

"\\&"

• \\& is Emacs' way of referencing the exact text that was matched by the regex.
• Wrapping it in double quotes (") ensures each matched character gets enclosed in ".

Step 4: Navigate and Apply Changes #

Once you've entered both values, you can control the replacement process:

• Press y to replace the current match and move to the next one.
• Press n to skip the current match without changing it.
• Press ! to replace all remaining matches automatically (no more prompts).
• Press Ctrl+g to cancel the operation at any time.

Optional: Blind Replace All #

If you're confident you want to replace every occurrence without reviewing, use M-x replace-regexp instead. Follow the same pattern and replacement string steps—this will apply all changes immediately.

Note on Encoding #

Ensure your buffer is using UTF-8 encoding (Emacs defaults to this for most cases). If not, run M-x set-buffer-file-coding-system and select utf-8 to properly handle Unicode characters.

内容的提问来源于stack exchange，提问作者Coeus Wang