i Have an arguments like the one below which i pass to powershell script

-arg1 -abc -def -arg2 -ghi -jkl -arg3 -123 -234

Now i need to extract three strings without any whitespace

string 1: "-abc -def"

string 2: "-ghi -jkl"

string 3: "-123 -234"

i figured this expression could do it. But this doesnt seem to work.

$args -match '-arg1(?'arg1'.*?) -arg3(?'arg3'.*?) -arg3(?'arg3'.*)'. 

THis should return $matches['arg1'] etc. So whats wrong in above expression. Why do i get an error as shown below

runScript.ps1 -arg1 -abc -def -arg2 -ghi -jkl -arg3 -123 -234

Unexpected token 'arg1'.?) -arg2 (?'arg2'.?) -arg3 (?'arg3'.)'' in expression or statement. At G:\powershell\tools\powershell\runTest.ps1:1 char:71 + $args -match '-arg1 (?'arg1'.?) -arg2 (?'arg2'.?) -arg3 (?'arg3'.)' <<<< + CategoryInfo : ParserError: (arg1'.?) -arg2...g3 (?'arg3'.)':String) [], ParseException + FullyQualifiedErrorId : UnexpectedToken

and also the second question is how do i make arg1 or arg2 or arg3 optional?

The argument to script can be

-arg2 -def -ghi.

I'll take some default values for arg(1|2|3) that is not mentioned.

Thanks