Regex/ARM/Template_Function.regex.ps1
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<# .Synopsis Matches a ARM Function .Description Matches a Azure Resource Manager function and it's arguments #> param( # One or more function names. By default, will match any function. [string[]] $FunctionName = '\w+' ) # Lookbehind to find the right context @' (?<= # We don't want to include the preceeding character, so we use a lookbehind (?<=). (?> # It can only be one of the following (?> atomic match): \[ # A bracket (the function could be the first thing in the template expression) | # OR \( # An open parenthesis (the function may be contained in another function) | # OR , # A comma (the function may be contained in another function and not the first argument in that function) ) # and the (?> ) syntax says this is not included in the match because we need to check for expressions explicitly below \s{0,} # We also don't need to include any preceeding whitespace in the match itself ) '@ + # Match and capture the function name @" (?<FunctionName> # We want to capture the function name (?> $($FunctionName -join '|') ) ) "@ + # Match the function arguments @' \s{0,} (?<Parameters>\( # Match the opening parenthesis (?> [^\(\)]+ # Match any non-parenthesis | \((?<Depth>) # If an open parenthesis is matched, increment depth | \)(?<-Depth>) # If a close paranthesis is match, decrement depth )*(?(Depth)(?!)) # continue matching until there is no depth \)) # match the closing parenthesis '@ |