Notepad++替换格式符号（如换行符Tab符等）
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（前提是要选中 正则表达式模式）
| 查找目标 | 替换为 | 说明 |
|---|---|---|
| , | 在行尾加上逗号 | |
| 替换为空，即合并多行内容为一行 | ||
| 把 windows 下的换行符替换为 linux 下的换行符 | ||
| 把 替换为空，即把 windows 下的换行符替换为 Mac 下的换行符 | ||
| , | 把逗号全部替换成换行 | |
| 去掉空行 | ||
| 1ss | 1 | 去掉 1 后的两个空格，其中一个 s 表示一个空格 |
| 1两个半角空格 | 1 | 可以直接在 1 后跟两个半角空格来匹配，跟上面 s 是一样的效果 |
| 在每行行首添加制表符，即四个半角空格的效果 |
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原文链接：https://blog.csdn.net/lijing742180/java/article/details/85174564
Extended Search Mode
In extended mode, these escape sequences (a backslash followed by a single character and optional material) have special meaning, and will not be interpreted literally.
: the Line Feed control character LF (ASCII 0x0A)
: The Carriage Return control character CR (ASCII 0x0D)
: the TAB control character (ASCII 0x09)
: the NUL control character (ASCII 0x00)
: the literal backalash character (ASCII 0x05C)
: the binary representation of a byte, made of 8 digits which are either 1’s or 0’s. ?
o: the octal representation of a byte, made of 3 digits in the 0-7 range
d: the decimal representation of a byte, made of 3 digits in the 0-9 range
x: the hexadecimal representation of a byte, made of 2 digits in the 0-9, A-F/a-f range.
u: The hexadecimal representation of a two byte character, made of 4 digits in the 0-9, A-F/a-f range. In Unicode builds, finds a Unicode character (for instance, u2020 matches the ? char, in an UTF-8 encoded file). In ANSI builds, finds characters requiring two bytes, like in the Shift-JIS encoding. ?
?NOTE: While some of these Extended Search Mode escape sequences look like regular expression escape sequences, they are not identical. Ones marked with ? are different from or not available in regular expressions.
来源： https://npp-user-manual.org/docs/searching/#extended-search-mode
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