regex replace in powershell command duplicates characters: a bug in powershell?

Asked Mar 25 '21 at 22:39

Active Mar 25 '21 at 22:39

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Say I want to rename files in a file tree and add an extension. I used this powershell command, but there is a bug: it adds the extension twice; why ? how to correct this ?

 get-childitem * -recurse -exclude *.h | where { !$_.PSIsContainer } |
     rename-item -newname {$_.name -replace '(\w*)','$1.h'} -whatif

asked Mar 25 '21 at 22:39

Soleil

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If you just want to **add** an extension you could simply do `-newname ($_.name + '.h')` – Olaf Mar 25 '21 at 22:42
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`*` matches 0 chars. Use `+`. – Wiktor Stribiżew Mar 25 '21 at 22:42
@WiktorStribiżew That was the right thing ! and it is logical. – Soleil Mar 25 '21 at 22:48
@Olaf the command does not work as expected, I lose the whole filename – Soleil Mar 25 '21 at 22:48
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I think @Olaf meant `-newname { $_.name + '.h' }` (a [delay-bind script block](https://stackoverflow.com/a/52807680/45375), as in your own attempt). Applied to a simplified version of your command: `get-childitem -file -recurse -exclude *.h | rename-item -newname { $_.name + '.h' } -WhatIf` – mklement0 Mar 25 '21 at 22:54
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See also: https://stackoverflow.com/q/52351217/45375 – mklement0 Mar 25 '21 at 22:56
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In every case I've seen involving regex, it's the implementer, not the regex system ;) – Colyn1337 Mar 25 '21 at 23:08

regex replace in powershell command duplicates characters: a bug in powershell?

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