在文件中搜索三个连续的文本行

Question

问题：我需要在一个文件中搜索一些文本，它包含三行连续行的文本。如何验证（查找是否存在）这些行在文件中？

预期返回值：布尔值

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示例输入文件：text.txt

one
two
three
four
five

要搜索的示例模式

two
three
four

Answer 1

简单答案：

$file = (Get-Content -Raw file.txt) -replace "`r" # removing "`r" if present

$pattern = 'two
three
four' -replace "`r"

$file | Select-String $pattern -Quiet -SimpleMatch

重新编辑。哇。这是一种棘手的方法。在提示符处，$pattern 没有“`r”，但在脚本中却有。这应该作为脚本或在提示符下工作。

$file = (get-content -raw file.txt) -replace "`r"

$pattern = 'two
three
four' -replace "`r"

# just showing what they really are
$file -replace "`r",'\r' -replace "`n",'\n'
$pattern -replace "`r",'\r' -replace "`n",'\n'

# 4 ways to do it
$file -match $pattern
$file | select-string $pattern -quiet -simplematch
$file -like "*$pattern*"
$file.contains($pattern)

# output
one\ntwo\nthree\nfour\nfive\n
two\nthree\nfour
True
True
True
True

嗯，尝试正则表达式。在单行模式下，一个 .可以匹配“`r”或“`n”。

$file = get-content -raw file.txt
$pattern = '(?s)two.{1,2}three.{1,2}four'
# $pattern = 'two\r?\nthree\r?\nfour'
# $pattern = 'two\r\nthree\r\nfour'
# $pattern = 'two\nthree\nfour'
$file -match $pattern
$file | select-string $pattern -quiet