Return symbol: Difference between revisions
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* 支援 [[Regular expression]] 的文字編輯軟體，例: [[Regular expression#將Email清單，轉成Email軟體可以使用的寄信名單 (取代換行符號為逗號) | 將Email清單，轉成Email軟體可以使用的寄信名單 (取代換行符號為逗號)]] | * 支援 [[Regular expression]] 的文字編輯軟體，例: [[Regular expression#將Email清單，轉成Email軟體可以使用的寄信名單 (取代換行符號為逗號) | 將Email清單，轉成Email軟體可以使用的寄信名單 (取代換行符號為逗號)]] | ||
* MySQL: {{kbd | key=<nowiki>SELECT REPLACE(REPLACE(REPLACE(`column`,'\r\n',''),'\n',''),'\r','') </nowiki>}} <ref> [https://stackoverflow.com/questions/13273343/replace-new-line-character-in-mysql-not-working sql - REPLACE new line character in MYSql not working - Stack Overflow] </ref> or {{kbd | key=<nowiki>SELECT TRIM(REPLACE(`column`, '\n','' ))</nowiki>}} <ref>[https://stackoverflow.com/questions/28368785/mysql-trim-both-whitespace-and-newline-characters MySQL: trim *both* whitespace and newline characters - Stack Overflow]</ref> | * MySQL: {{kbd | key=<nowiki>SELECT REPLACE(REPLACE(REPLACE(`column`,'\r\n',''),'\n',''),'\r','') </nowiki>}} <ref> [https://stackoverflow.com/questions/13273343/replace-new-line-character-in-mysql-not-working sql - REPLACE new line character in MYSql not working - Stack Overflow] </ref> or {{kbd | key=<nowiki>SELECT TRIM(REPLACE(`column`, '\n','' ))</nowiki>}} <ref>[https://stackoverflow.com/questions/28368785/mysql-trim-both-whitespace-and-newline-characters MySQL: trim *both* whitespace and newline characters - Stack Overflow]</ref> | ||
* Excel: [https://www.ablebits.com/office-addins-blog/2013/12/03/remove-carriage-returns-excel/ 3 ways to remove carriage returns in Excel: formulas, VBA macro, find&replace dialog] {{access | date = 2018-05-24}} | |||
* Excel: {{kbd | key=<nowiki>=TRIM(SUBSTITUTE(SUBSTITUTE(A1, CHAR(13),""), CHAR(10),", ")</nowiki>}} To replace the return symbol in the cell located at {{kbd | key=A1}} <ref>[https://www.ablebits.com/office-addins-blog/2013/12/03/remove-carriage-returns-excel/ 3 ways to remove carriage returns in Excel: formulas, VBA macro, find&replace dialog] {{access | date = 2018-05-24}}</ref><ref>[https://en.wikipedia.org/wiki/ASCII ASCII - Wikipedia]</ref> | |||
** {{kbd | key=CHAR(10)}} means Line feed which equal to {{kbd | key=<nowiki>\n</nowiki>}} | |||
** {{kbd | key=CHAR(13)}} means Carriage return which equal to {{kbd | key=<nowiki>\r</nowiki>}} | |||
* Python way: [https://stackoverflow.com/questions/275018/how-can-i-remove-a-trailing-newline-in-python How can I remove a trailing newline in Python? - Stack Overflow] {{access | date = 2019-06-14}} | * Python way: [https://stackoverflow.com/questions/275018/how-can-i-remove-a-trailing-newline-in-python How can I remove a trailing newline in Python? - Stack Overflow] {{access | date = 2019-06-14}} | ||
Revision as of 11:05, 24 July 2021
換行符號。英文：Return symbol, line terminators, line endings, newline, end of line (EOL), line feed (LF) or line break
- On Win
: CRLF = \r\n - On Unix, Linux
& recent versions of macOS 
: LF = \n - On classic versions of macOS [1][2] e.g. Mac OS 9: CR = \r
如何使用編輯軟體，看到換行符號
查看每一行使用的換行符號
- Notepad++ On Win 選單 → 檢視 → 特殊字元 → 顯示行尾字元 (EOL)
- RawLineEdit for Sublime text
- 換行符號是 CRLF = \r\n 每行最後顯示的是 <0x0d>¬
- 換行符號是 LF = \n 每行最後顯示的是 ¬ 象形符號 (glyph)
- 換行符號是 CR = \r 每行最後顯示的是 <0x0d>
- BASH cat command e.g. cat -e <filename>
- 換行符號是 CRLF = \r\n 每行最後顯示的是 ^M$
- 換行符號是 LF = \n 每行最後顯示的是 $
- 換行符號是 CR = \r 每行最後顯示的是 ^M
查看檔案使用的換行符號
- atom/line-ending-selector: Switch between Unix and Window style line endings. for Atom on Win , macOS & Linux
- file (command): file filename.txt on Linux , macOS [3] & Cygwin on Win
| 檔案內容 | File command 偵測結果 |
|---|---|
| 換行符號是 CRLF = \r\n | UTF-8 Unicode text, with CRLF line terminators |
| 換行符號是 LF = \n | UTF-8 Unicode text  |
| 換行符號是 CR = \r | UTF-8 Unicode text, with CR line terminators |
| 特例: 換行符號夾雜 \r\n 和 \r | UTF-8 Unicode text, with CRLF, CR line terminators |
| 特例: 換行符號夾雜 \r\n 和 \n | UTF-8 Unicode text, with CRLF, LF line terminators |
| 特例: 換行符號夾雜 \n 和 \r | UTF-8 Unicode text, with CR, LF line terminators |
| 特例: 無內容的空檔案 | empty |
不同換行符號 在不同作業系統的編輯器看到的文件狀況
| 檔案內容 | Windows 10 內建「記事本」 | Windows 10 免費編輯器 Notepad++ v. 7.5.9 | Mac 內建「文字編輯.app」 | Mac 編輯器 Sublime Text v. 3.2 |
|---|---|---|---|---|
| 換行符號是 CRLF = \r\n | ok | ok | ok | ok |
| 換行符號是 LF = \n | 預期不同行的內容擠在一起 |
ok | ok | ok |
| 換行符號是 CR = \r | 預期不同行的內容擠在一起 |
ok | ok | ok |
如何取代換行符號
- 支援 Regular expression 的文字編輯軟體，例: 將Email清單，轉成Email軟體可以使用的寄信名單 (取代換行符號為逗號)
- MySQL: SELECT REPLACE(REPLACE(REPLACE(`column`,'\r\n',''),'\n',''),'\r','') [4] or SELECT TRIM(REPLACE(`column`, '\n','' )) [5]
- Excel: =TRIM(SUBSTITUTE(SUBSTITUTE(A1, CHAR(13),""), CHAR(10),", ") To replace the return symbol in the cell located at A1 [6][7]
- CHAR(10) means Line feed which equal to \n
- CHAR(13) means Carriage return which equal to \r
- Python way: How can I remove a trailing newline in Python? - Stack Overflow [Last visited: 2019-06-14]
Related articles
- Carriage return - Wikipedia
- 換行 - 维基百科，自由的百科全书
- 回車鍵 - 維基百科，自由的百科全書
- 陳雲濤的部落格: 筆記 CRLF跟LF之區別 --- 隱形的 bug:「CRLF才是真正的打字機運作方式，你可以想像：打字機打到最右邊，要先return到最左邊之後，再往下一行，所以是CRLF ... ...」
- Differences in end of line characters Mac, Windows, and Linux
- php - How to remove carriage returns from output of string? - Stack Overflow
References
- ↑ Classic Mac OS - Wikipedia
- ↑ Newline - Wikipedia
- ↑ file(1) Mac OS X Manual Page
- ↑ sql - REPLACE new line character in MYSql not working - Stack Overflow
- ↑ MySQL: trim *both* whitespace and newline characters - Stack Overflow
- ↑ 3 ways to remove carriage returns in Excel: formulas, VBA macro, find&replace dialog [Last visited: 2018-05-24]
- ↑ ASCII - Wikipedia