maki:
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Nonsense. My regular expression is valid for Boost.Regex
Boost.Regex 5.1.3
John Maddock
boost.org/doc/libs/_1_66_0_/libs/regex/doc/html/index.html
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There is different syntax for different regular expression engines.
You don't need to make your expression so complicated, you can use:
[0-3][0-9].[0-3][0-9].[0-9]{4}
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