我正在寻找一种方法，根据用户输入的内容，在看起来像是上午8点或上午8:00之前删除所有文本。这可能是包括pm在内的任何时间。
这是我要找的东西：
$appointment = "9th annual fundraiser - 8:30 am - 3 pm"
它也可能像这样：
$appointment = "9th annual fundraiser - (8:30 am - 3 pm)"
或
$appointment = "9th annual fundraiser - (event 8:30 am - 3 pm)"
或
$appointment = "9th annual fundraiser 8:30 am - 3:00 pm"
我在大多数其他应用程序中使用的是以下内容：
$appointment -creplace '^[^1-9]*'
，但是在这种情况下不起作用，我一直在使用？和其他所有内容寻找良好的答案，但我不理解。
我的目标是使它跳过这种情况下的第一个数字（可以是1st，2nd，3rd，4th等），并使其超时。这样$appointment看起来像：
上午8:30-下午3点
我尝试使用这些公式，但似乎无法告诉它拉出 通常 的时间是X：XX。
答案 0 :(得分：1)
以下是基于此正则表达式的解决方案：\d+(:\d+)?\s+[ap]m
RegEx说明：
\d+：一位或多位数字(:\d+)?：冒号后跟一个或多个
数字。此组合的一或零。这是如何工作的3:00
上午和凌晨3点。\s+：一个或多个空格（在3:00和AM之间）。使其\s*成为可选的空间。[ap]m：上午或下午解决方案1
$regex = "\d+(:\d+)?\s+[ap]m"
$matches = ($appointment | Select-String $regex -AllMatches).Matches.Value
$matches -join " - "
解决方案2
$regex = "\d+(:\d+)?\s+[ap]m"
$regex = $regex + "\s*[-]\s*" + $regex
$matches = ($appointment | Select-String $regex -AllMatches).Matches.Value
$matches
如果您确定输入内容包含2次，则我更喜欢解决方案1，因为它与两次之间的时间无关。因此，它也适用于“下午3点至下午6点”之类的事情。
答案 1 :(得分：0)
这是使用正则表达式的一种方法：
Function Get-StringTime()
{
# Set up a results ArrayList
$results = New-Object System.Collections.ArrayList
$regexs = @(
# See https://regexr.com/ and you can drop
# these expressions into the bar up top and
# the Tools section at the bottom will explain
# each expression
[regex]"\b\d{1}:\d{2}(am|pm)-\d{1}:\d{2}(am|pm)\b", # matches 8:00am-3:00pm
[regex]"\b\d{1}(am|pm)-\d{1}(am|pm)\b", # matches 8am-3pm
[regex]"\b\d{1}:\d{2}(am|pm)-\d{1}(am|pm)\b", # matches 8:00am-3pm
[regex]"\b\d{1}(am|pm)-\d{1}:\d{2}(am|pm)\b" # matches 8am-3:00pm
)
# Setup sample data, 1 for each match
$a1 = '9th annual fundraiser - (8am - 3pm)'
$a2 = '9th annual fundraiser - (8am - 3:00pm)'
$a3 = '9th annual fundraiser - (8:00am - 3pm)'
$a4 = '9th annual fundraiser - (8:00am - 3:00pm)'
$a5 = '9th annual fundraiser - (13:00pm - 1:00am)'
$arrs = @($a1, $a2, $a3, $a4, $a5)
foreach($appointment in $arrs)
{
# strip out all the spaces so we can use less regexs
$newAppointment = $appointment.Replace(' ','')
Write-Host "`nAppointment data: " -NoNewline
Write-Host $newAppointment -ForegroundColor Magenta
# check this against each regex
foreach($regex in $regexs)
{
Write-Host "Trying regex: " -NoNewline
<#
To show the user the regex being used
we need to convert to a string, otherwise
it will return an object type of RegEx
which default outputs like this:
Options MatchTimeout RightToLeft
------- ------------ -----------
None -00:00:00.0010000 False
#>
Write-Host $($regex.ToString()) -ForegroundColor Yellow
if($regex.Match($newAppointment).Value -ne '')
{
Write-Host "Match found | " -NoNewline -ForegroundColor Green
Write-Host "Item: $($arrs.IndexOf($appointment)) | Regex match Index: $($regexs.IndexOf($regex))"
$results.Add([PSCustomObject]@{
TimeString=$regex.Match($newAppointment).Value;
AppointmentIndex=$($arrs.IndexOf($appointment));
MatchingRegex=$regex.ToString();
MatchingRegexIndex=$regexs.IndexOf($regex);
}) | Out-Null
}
else {
Out-Null
}
}
}
return $results
}
Get-StringTime
输出返回（在PS控制台中带有颜色）：
Appointment data: 9thannualfundraiser-(8am-3pm)
Trying regex: \b\d{1}:\d{2}(am|pm)-\d{1}:\d{2}(am|pm)\b
Trying regex: \b\d{1}(am|pm)-\d{1}(am|pm)\b
Match found | Item: 0 | Regex match Index: 1
Trying regex: \b\d{1}:\d{2}(am|pm)-\d{1}(am|pm)\b
Trying regex: \b\d{1}(am|pm)-\d{1}:\d{2}(am|pm)\b
Appointment data: 9thannualfundraiser-(8am-3:00pm)
Trying regex: \b\d{1}:\d{2}(am|pm)-\d{1}:\d{2}(am|pm)\b
Trying regex: \b\d{1}(am|pm)-\d{1}(am|pm)\b
Trying regex: \b\d{1}:\d{2}(am|pm)-\d{1}(am|pm)\b
Trying regex: \b\d{1}(am|pm)-\d{1}:\d{2}(am|pm)\b
Match found | Item: 1 | Regex match Index: 3
Appointment data: 9thannualfundraiser-(8:00am-3pm)
Trying regex: \b\d{1}:\d{2}(am|pm)-\d{1}:\d{2}(am|pm)\b
Trying regex: \b\d{1}(am|pm)-\d{1}(am|pm)\b
Trying regex: \b\d{1}:\d{2}(am|pm)-\d{1}(am|pm)\b
Match found | Item: 2 | Regex match Index: 2
Trying regex: \b\d{1}(am|pm)-\d{1}:\d{2}(am|pm)\b
Appointment data: 9thannualfundraiser-(8:00am-3:00pm)
Trying regex: \b\d{1}:\d{2}(am|pm)-\d{1}:\d{2}(am|pm)\b
Match found | Item: 3 | Regex match Index: 0
Trying regex: \b\d{1}(am|pm)-\d{1}(am|pm)\b
Trying regex: \b\d{1}:\d{2}(am|pm)-\d{1}(am|pm)\b
Trying regex: \b\d{1}(am|pm)-\d{1}:\d{2}(am|pm)\b
Appointment data: 9thannualfundraiser-(13:00pm-1:00am)
Trying regex: \b\d{1}:\d{2}(am|pm)-\d{1}:\d{2}(am|pm)\b
Trying regex: \b\d{1}(am|pm)-\d{1}(am|pm)\b
Trying regex: \b\d{1}:\d{2}(am|pm)-\d{1}(am|pm)\b
Trying regex: \b\d{1}(am|pm)-\d{1}:\d{2}(am|pm)\b
TimeString AppointmentIndex MatchingRegex MatchingRegexIndex
---------- ---------------- ------------- ------------------
8am-3pm 0 \b\d{1}(am|pm)-\d{1}(am|pm)\b 1
8am-3:00pm 1 \b\d{1}(am|pm)-\d{1}:\d{2}(am|pm)\b 3
8:00am-3pm 2 \b\d{1}:\d{2}(am|pm)-\d{1}(am|pm)\b 2
8:00am-3:00pm 3 \b\d{1}:\d{2}(am|pm)-\d{1}:\d{2}(am|pm)\b 0
希望这会给您一些破解的机会。如果您想使其更可重用，则可以在函数调用中添加一个参数，例如：
Function Get-StringTime([String]$AppointmentText){...}
并在PS提示符或加载此功能的脚本中调用它（可以是硬编码，也可以是 可以从导入的模块中获得更好的效果）
$someVariable = Get-StringTime -AppointmentText '9th annual fundraiser - (8am - 3pm)'
Write-Output $someVariable
这将需要剪切我添加的代表某些可能情况的硬编码示例，从$a1到$a5，然后将$arrs更改为$arrs = @($AppointmentText)或其他方式，直到您喜欢什么。
请注意，这不考虑军事风格的时间XX：XX或时间字符串中:前有2位数字的排列。
如果您有任何疑问，请告诉我