CODEWITHSUNDEEP
regexpowershell
Jan Girke
Jan Girke

Reputation: 156

Powershell SWITCH and REGEX

Hi can anybody help me I am stuck and can't get regex to work with powershell and a switch statement. Could not find anything on the web that was helpful either.

How can I filter an IP for example or a string of 7 to 8 numbers?

switch -regex ($buffer)
{
   ($buffer -match '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')
   {}

   ($buffer -match {'\d{7,8}'})
   {}
}

Upvotes: 4

Views: 10075

Answers (2)

Mathias R. Jessen
Mathias R. Jessen

Reputation: 174690

When used in -regex mode, PowerShell expects the case condition to be a regex pattern, nothing else:

switch -regex ($buffer)
{
   '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
   {
       # looks kinda like an IP
   }

   '\d{7,8}'
   {
       # just numbers
   }
}

Upvotes: 9

Janne Tuukkanen
Janne Tuukkanen

Reputation: 1660

Use braces instead of parenthesis, and omit the variable for switch altogether:

switch (1)
{
   { $buffer -match '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' }
   { Write-Output "IP Address" }

   { $buffer -match '\d{7,8}' }
   { Write-Output "7-8 digits" }
}

Upvotes: 1

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