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Replace the first regex match in a string with a static string

Transform "Red Green Blue" into "R*d Green Blue" by replacing /e/ with "*"
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ruby
p "Red Green Blue".sub(/e/,'*')
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cpp C++/CLI .NET 2.0
String^ Replaced = (gcnew Regex("e"))->Replace("Red Green Blue", "*", 1);
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clojure
(.replaceFirst (re-matcher #"e" "Red Green Blue") "*")
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fsharp
let replaced = ((new Regex("e")).Replace("Red Green Blue", "*", 1))
printfn "%s" replaced

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