processing before call

> Because it operates on an individual match, it is also possible to perform processing on the matched string before you call the Result method.

What is this sentence about? How this can be used? Is the value returned by the method depends on something other than parameter?

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* ID: 35e9096f-3099-4336-daf6-ddb51df15f0a
* Version Independent ID: 2dc7e739-d47c-da1d-7de9-aad3104b64fb
* Content: [Match.Result(String) Method (System.Text.RegularExpressions)](https://docs.microsoft.com/en-us/dotnet/api/system.text.regularexpressions.match.result?view=netframework-4.7.2)
* Content Source: [xml/System.Text.RegularExpressions/Match.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Text.RegularExpressions/Match.xml)
* Product: **.net**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **dotnetcontent**