正则表达式需要跳过命名模式C＃中的单词

Question

I have a list of regex patterns I'm looping through, and doing an action if it is successful. Here's what I have now:

string csvText = 
  "A Minimum Usage Fee of ten dollars and ninety-nine cents ($10.99) for each Customer ESI ID with electricity consumption less than 1,000 kWh per billing cycle.";

string csvPattern =
  @"A Minimum Usage Fee of (\p{Sc}*(?<cost>\s?\d+[., ]?\d*)) for each Customer ESI ID with electricity consumption (?<comparator>[a-zA-Z0-9\s]+) (?<usage>[0-9, ]+) kWh per billing cycle.";

Regex regex = new Regex(csvPattern);
var match = regex.Match(csvText);

However, I have a string that will vary ("ten dollars and ninety-nine cents"), and then the value I want ("10.99"). How do I tell a named regex string to skip those words? I've tried (unsuccessfully) adding a look-behind in the cost group, but it does not match.

Answer 1

If the cost format is consistent then you don't need (\\p{Sc}*(?<cost>\\s?\\d+[., ]?\\d*)) .

You should go with (?<cost>\\$\\d+(?:\\.\\d+)?)

string csvText = "A Minimum Usage Fee of ten dollars and ninety-nine cents ($10.99) for each Customer ESI ID with electricity consumption less than 1,000 kWh per billing cycle.";
        string csvPattern =
            @"A Minimum Usage Fee of [A-Za-z -]+ \((?<cost>\$\d+(?:\.\d+)?)\) for each Customer ESI ID with electricity consumption (?<comparator>[a-zA-Z0-9\s]+) (?<usage>[0-9, ]+) kWh per billing cycle\.";

    Regex regex = new Regex(csvPattern);
    var match = regex.Match(csvText);

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