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PowerShell regex count specific character or number

Example input is: 0009911000


$Input_Number = '0009911000'

#[1] = tells regex to match on the right or look forward
$xtotal=[regex]::Matches($Input_Number,'0+')[1].Value.Length

#[0] = tells regex to match on the left or look backward
$ytotal=[regex]::Matches($Input_Number,'0+')[0].Value.Length

#Matches($Number,'0+') means #Matches($input, $pattern)

Write-Output $xtotal
Write-Output $ytotal

Image output from PowerShell ISE:



Above code works or matches if input is something like this: “0009911000” There are zeroes on the left and right and in between are any numbers or characters.

For input like this: 0000991100010 in which zeroes are in different position of the string the below code will work.

$Input_Number = '0000991100010'
$xytotal=[regex]::Matches($Input_Number,'[0]*[0]*[0]+')
Write-Output $xytotal

Output will be something like this:
Groups   : {0000}
Success  : True
Captures : {0000}
Index    : 0
Length   : 4
Value    : 0000

Groups   : {000}
Success  : True
Captures : {000}
Index    : 8
Length   : 3
Value    : 000

Groups   : {0}
Success  : True
Captures : {0}
Index    : 12
Length   : 1
Value    : 0

Image output from PowerShell ISE:



Regex is not easy it might take a while to digest and depends on what data being processed, the regex pattern used to match the data will be different. It will be not a one size fits all solution. Mileage will always vary when working with regex, if your task requires a lot of regex then practice is a must.

Regular Expression quick reference from Microsoft: https://docs.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-language-quick-reference



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