Filtering for strings in PowerShell

Question

I would like to implement some custom cmdlets that filter some object by name, and I would like to use wild-card enabled search like for common cmdlets (Get-ChildItem and Get-Process).

How can I implement this kind of search? Are there some examples or even some reusable components? Any examples?

Rafael Dowling Goodman · Accepted Answer · 2012-07-11 02:24:50Z

1

For the most part, these types of cmdlets leverage the WildcardPattern class.

Here's an example of how to use it directly from the PowerShell prompt:

PS>$w = New-Object System.Management.Automation.WildcardPattern "*foo*"
PS>$w.IsMatch("foobar")
True
PS>$w.IsMatch("barbar")
False

answered Jul 11, 2012 at 2:24

Rafael Dowling Goodman

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Comments

Peter Mortensen · Accepted Answer · 2014-12-15 21:09:48Z

0

You can define your own filter by piping a collection of objects to Where-Object (or the short-form ?).

For example, if you get a collection of file objects by doing gci (alias of Get-ChildItem), you can display only the ones that have the text log in them by doing this: gci | ?{$_.name -match "log"}.

edited Dec 15, 2014 at 21:09

Peter Mortensen

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answered Apr 20, 2012 at 19:23

SpellingD

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3 Comments

fra Over a year ago

Thanks for the suggestion, but I would like to implement it within the cmdlet because I would like to filter data accessed in a database.

SpellingD Over a year ago

Some cmdlets have filters (gci -filter "query"), but the filters are based upon the provider (for gci, it would be the filesystem provider) and aren't actually defined within the cmdlets themselves.

JasonMArcher Over a year ago

What @SpellingD means is that you would use the value of $Filter directly on your database query (after sanitizing it of course!).

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