使用sed替换含特殊字符与数字的字符串失败，求解决方案

Let's break down why your original sed command failed and walk through the corrected version that should work for your use case.

Why Your Original Command Didn't Work #

You ran into a few common pitfalls with sed and shell escaping:

1. Unescaped regex special characters: The +, (, and ) in your target string are regex metacharacters. Sed interprets + as "match one or more of the previous character" and () as capture group delimiters, not literal characters.
2. Backslash escape conflicts: The \xXX sequences in your command were being misinterpreted. If your file contains literal \x86 (the characters \, x, 8, 6 rather than the hex byte 0x86), sed was trying to parse \x86 as a hex escape instead of matching the literal string. Even worse, your shell might have tried to parse those escapes before passing them to sed.
3. Incorrect replacement string escaping: Similarly, the \xXX in your replacement text needs special handling—sed uses \ as an escape character in the replacement section too, so you need to double them to output literal backslashes.

Corrected Sed Command #

For GNU Sed (Linux Systems) #

sed -i 's/4328" \+ base64_encode\("\\x86\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\x25\\x07\\x2E\\x01\\x02\\x03\\x04\\xBB\\x01\\x62\\x1A\\x01\\x01/"4321\\x38\\x80\\x81\\x82\\x83\\x84\\x85\\x86\\x87\\x88\\x89\\x8A\\x8B\\x8C\\x8D\\x8E\\x8F\\x90\\x91\\x92\\x93"/g' *.utt

For BSD Sed (macOS Systems) #

BSD sed requires an empty suffix with the -i flag (to avoid creating backup files automatically):

sed -i '' 's/4328" \+ base64_encode\("\\x86\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\x25\\x07\\x2E\\x01\\x02\\x03\\x04\\xBB\\x01\\x62\\x1A\\x01\\x01/"4321\\x38\\x80\\x81\\x82\\x83\\x84\\x85\\x86\\x87\\x88\\x89\\x8A\\x8B\\x8C\\x8D\\x8E\\x8F\\x90\\x91\\x92\\x93"/g' *.utt

Key Changes Explained #

• Escaped regex metacharacters: I changed + to \+, ( to \( so sed treats them as literal characters instead of regex syntax.
• Literal backslash matching: Each \xXX in the search pattern became \\xXX—this tells sed to match the literal \ followed by xXX instead of parsing it as a hex escape.
• Literal backslash output: Each \xXX in the replacement string also became \\xXX to ensure sed outputs a literal backslash instead of interpreting it as an escape for capture groups or other sed features.
• Single-quoted script: Wrapping the entire sed command in single quotes prevents your shell from parsing any of the special characters or escapes before they reach sed.

If You're Matching Hex Bytes (Not Literal \xXX Strings) #

If your file contains the actual hex bytes (e.g., 0x86 instead of the string \x86), use printf to generate the correct binary strings for sed to match:

# Generate the exact binary search string
SEARCH=$(printf '4328" + base64_encode("\x86\x01\x02\x03\x04\x05\x06\x07\x25\x07\x2E\x01\x02\x03\x04\xBB\x01\x62\x1A\x01\x01')
# Generate the binary replacement string
REPLACE=$(printf '"4321\x38\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8A\x8B\x8C\x8D\x8E\x8F\x90\x91\x92\x93"')
# Run sed with the pre-generated strings
sed -i "s/$SEARCH/$REPLACE/g" *.utt

This avoids escape confusion by letting printf handle the hex-to-byte conversion before passing the strings to sed.

内容的提问来源于stack exchange，提问作者Abrar Ahamed