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Check if a string matches a regular expression

Display "ok" if "Hello" matches /[A-Z][a-z]+/
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erlang
String = "Hello", Regexp = "[A-Z][a-z]+",
is_match(String, Regexp) andalso (begin io:format("ok~n"), true end).
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erlang 12B3+
case re:run("Hello", "[A-Z][a-z]+") of {match, _} -> ok end.
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fsharp
if (Regex.IsMatch("Hello", "[A-Z][a-z]+")) then printfn "ok"

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