powershell - 使用PowerShell删除行

Question

我想在使用Powershell中删除空行。
这是我的文字

Line 1
Line 2
<Empty line>
<Empty line>
Line 3
Line 4

我试过使用-replace(“`n”，“”)，但是它不起作用。
请帮忙!

Answer 1

$text = """
Line 1
Line 2


Line 3
Line 4
"""

$text -replace "(?m)^\s*`r`n",''
# Or
$text -replace "(?m)^\s*`n",''

正则表达式解释:

(?m) set the multiline flag so ^ matches the beginning of each line and not just the begining of the whole string.
^ matches the beginning of a line
\s* matches any number of white spaces (could also be 0 white spaces)
`r`n matches the end of a line.

为什么`r`n或只是`n(取决于机器或文件):

\`r = CR (Carriage Return) → Used as a new line character in Mac OS before X
\`n = LF (Line Feed) → Used as a new line character in Unix/Mac OS X
\`r\`n = CR + LF → Used as a new line character in Windows