RegEx/JSON/ListItem.regex.ps1
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<# .Synopsis Matches a JSON list item .Description Matches a JSON list item. If no -ListIndex is provided, will match all items in the list #> param( [int] $ListIndex = -1 ) $jsonValue = @' \s{0,} # Match preceeding whitespace (?> # A JSON value can be: (?<IsTrue>true) # 'true' | # OR (?<IsFalse>false) # 'false' | # OR (?<IsNull>null) # 'null' | # OR (?<Object> # an object, which is \{ # An open brace (?> # Followed by... [^\{\}]+| # any number of non-brace character OR \{(?<Depth>)| # an open brace (in which case increment depth) OR \}(?<-Depth>) # a closed brace (in which case decrement depth) )*(?(Depth)(?!)) # until depth is 0. \} # followed by a closing brace ) | # OR (?<List> # a list, which is \[ # An open bracket (?> # Followed by... [^\[\]]+| # any number of non-bracket character OR \[(?<Depth>)| # an open bracket (in which case increment depth) OR \](?<-Depth>) # a closed bracket (in which case decrement depth) )*(?(Depth)(?!)) # until depth is 0. \] # followed by a closing bracket ) | # OR (?<String> # A string, which is " # an open quote .*? # followed by anything (?=(?<!\\)" # until the closing quote ) | # OR (?<Number> # A number, which (?<Decimals> (?<IsNegative>\-)? # It might be start with a - (?:(?> # Then it can be either: (?<Characteristic>\d+) # One or more digits (the Characteristic) (?:\.(?<Mantissa>\d+)){0,1} # followed by a period and one or more digits (the Mantissa) | # Or it can be (?:\.(?<Mantissa>\d+)) # just a Mantissa )) (?: # Optionally, there can also be an exponent E # which is the letter 'e' (?<Exponent>[+-]\d+) # followed by + or -, followed by digits. )? ) ) ) ) \s{0,} # Optionally match following whitespace '@ $listItemParams = @{} + $PSBoundParameters if (-not $listItemParams.ContainsKey('ListIndex')) { @" (?> \[\s{1,}\] # An open bracket | \[ (?: (?<ListItem> $jsonValue ) (?:,)? ){1,} \] ) "@ } elseif ($ListIndex -ge 0) { $findListIndex = @" (?> \[ $(if ($ListIndex -ge 1) { @" (?: (?:$jsonValue) (?:,)? ){$listIndex} (?:,)? "@ }) (?<ListItem> $jsonValue ) ) "@ $findListIndex } |